CN117175518A - Control system and method for inhibiting input impact current and air conditioner - Google Patents
Control system and method for inhibiting input impact current and air conditioner Download PDFInfo
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Abstract
The application provides a control system and a control method for inhibiting input impact current, and an air conditioner, wherein the control system comprises the following components: the acquisition module acquires direct-current voltages at two ends of the bus capacitor according to a first detection period; the control module is used for judging whether the direct current voltage at two ends of the bus capacitor is smaller than a first preset threshold value or not; or the device is used for controlling the working state of the precharge circuit and/or the electric equipment according to the judging result; the pre-charging circuit is connected with the power grid alternating current and used for inhibiting the impact of starting current on the bus capacitor when the bus capacitor is just charged; and the bus capacitor is electrically connected with the electric equipment and is used for providing electric energy for the operation of the electric equipment. The application realizes avoiding larger input impact current, solves the problem that the input impact current is extremely easy to damage main board components, enhances the power grid voltage abnormal fluctuation resistance capability of the frequency converter, and avoids the damage of a unit caused by overlarge input current.
Description
Technical Field
The application relates to the technical field of circuit design for inhibiting input impact current, in particular to a control system and method for inhibiting input impact current and an air conditioner.
Background
The common single-phase driving circuit topology structure of the variable frequency air conditioner is AC-DC-AC: the input is 220V alternating current, the alternating current power supply is converted into direct current power supply through a rectifying circuit, and then the direct current power supply is converted into alternating current power supply with adjustable frequency and amplitude through an inverter circuit, and the alternating current power supply is supplied to load equipment such as electric equipment or fans.
In order to improve the power supply quality of a power grid and inhibit harmonic pollution, a PFC circuit is usually added after a rectifying circuit, and the adopted PFC circuit is usually a Boost type PFC circuit so as to Boost the voltage on a bus and realize a power factor correction function.
In order to protect the main board components, the power supply loop passes through a resistor in the charging circuit during charging so as to limit the charging current of the direct-current side bus capacitor. During normal operation, the charging resistor is bypassed through the relay so as to reduce the loss of the main board. When the frequency converter works, the frequency converter stops and displays the fault that the input voltage of the direct current power grid is too low when the direct current voltage at the two ends of the bus capacitor is detected to be lower than the protection value. Generally, the protection value is a fixed value, but if the power supply drops instantly but the direct current voltage at two ends of the bus capacitor does not drop below the protection value, and then the power supply returns to normal, the recovered power grid voltage is equivalent to directly increasing on the direct current bus capacitor, so that larger input impact current occurs, and the main board components are extremely damaged.
Thus, the prior art is still to be further developed.
Disclosure of Invention
The application aims to overcome the defects of the prior art, and provides a control system and a control method for inhibiting input impact current and an air conditioner, so as to solve the problems that in the prior art, if a power supply drops instantly but the direct current voltage at two ends of a bus capacitor does not drop below a protection value, and then the power supply returns to normal, the restored power grid voltage is equivalent to the direct current bus capacitor, so that larger input impact current occurs and main board components are extremely damaged.
To achieve the above object, according to a first aspect of the present application, there is provided a control system for suppressing an input rush current, the control system comprising:
the acquisition module acquires direct-current voltages at two ends of the bus capacitor according to a first detection period;
the control module is used for judging whether the direct current voltage at two ends of the bus capacitor is smaller than a first preset threshold value or not; or the device is used for controlling the working state of the precharge circuit and/or the electric equipment according to the judging result;
the pre-charging circuit is connected with the power grid alternating current and used for inhibiting the impact of starting current on the bus capacitor when the bus capacitor is just charged;
and the bus capacitor is electrically connected with the electric equipment and is used for providing electric energy for the operation of the electric equipment.
Specifically, the precharge circuit includes:
the power grid relay comprises a first relay, a second relay and a current limiting resistor, wherein one end of the first relay is electrically connected with the input end of the power grid alternating current, one end of the current limiting resistor at the other end of the first relay is connected, the other end of the current limiting resistor is electrically connected with a bus capacitor, and the second relay is connected in parallel with the two ends of the first relay and the two ends of the current limiting resistor.
According to a second aspect of the present application, there is provided a control method for suppressing an input rush current, comprising:
obtaining direct current voltages at two ends of a bus capacitor according to a first detection period;
judging whether the direct current voltage at two ends of the bus capacitor is smaller than a first preset threshold value or not;
and controlling the working state of the pre-charging circuit and/or the electric equipment according to the judging result.
Specifically, the outputting the working state related to controlling the precharge circuit and/or the working state of the electric equipment according to the judging result includes:
if the direct current voltage at the two ends of the bus capacitor is smaller than a first preset threshold value, the first relay and the second relay are controlled to be disconnected, and the electric equipment is controlled to stop running;
if the direct current voltage at the two ends of the bus capacitor is larger than or equal to a first preset threshold value, judging whether the direct current voltage at the two ends of the bus capacitor is larger than or equal to a third preset threshold value, and controlling the working state of the pre-charging circuit and/or the electric equipment according to the judging result.
Specifically, the method further comprises the following steps:
and acquiring the input voltage of the power grid according to the first detection period, calculating an effective value of the input voltage according to the input voltage of the power grid, judging whether the effective value of the input voltage is smaller than a second preset threshold value, and controlling the working state of the pre-charging circuit and/or the electric equipment according to a judgment result.
Specifically, the controlling the working state of the precharge circuit and/or the electric equipment according to the judgment result further includes:
if the effective value of the input voltage is smaller than a second preset threshold value, the first relay and the second relay are controlled to be disconnected, and the electric equipment is controlled to stop running.
Specifically, the method further comprises the following steps:
if the direct current voltage at the two ends of the bus capacitor is smaller than a third preset threshold value and the effective value of the input voltage is larger than or equal to the second preset threshold value, controlling the electric equipment to operate according to the lowest operating frequency and controlling the pre-charging circuit to start;
and if the direct current voltage at the two ends of the bus capacitor is larger than or equal to a third preset threshold value, controlling the pre-charging circuit to be closed, and controlling the electric equipment to operate according to the frequency set by a user.
Specifically, the control of the pre-charging circuit to start comprises the control of the first relay to be closed and the control of the second relay to be opened.
Specifically, the controlling of the pre-charging circuit to be closed comprises controlling the first relay to be opened and controlling the second relay to be closed.
According to a third aspect of the present application, there is provided an air conditioner comprising: a memory; and a processor, wherein the memory stores computer readable instructions, and the computer readable instructions implement the control method for suppressing the input impact current when being executed by the processor.
The beneficial effects are that:
the application provides a control system for inhibiting input impact current, which controls a precharge circuit to start working when a power supply instantaneously drops but the bus voltage of a power grid does not drop below a protection value and then the power supply is recovered to be normal, so that the input impact current is limited, the effect of protecting main board components is achieved, larger input impact current is avoided, the problem that the main board components are extremely damaged by the input impact current at the moment is solved, the abnormal fluctuation capacity of the power grid voltage of a frequency converter is enhanced, and the damage of a machine set caused by overlarge input current is avoided.
Drawings
FIG. 1 is a schematic circuit diagram of a control system for suppressing input inrush current provided in an embodiment of the present application;
FIG. 2 is a schematic diagram of the system components of a control system for suppressing input surge current provided in an embodiment of the application
Fig. 3 is a flowchart of a control method for suppressing an input rush current provided in an embodiment of the present application.
Detailed Description
In order to make the technical solution of the present application better understood by those skilled in the art, the technical solution of the present application will be clearly and completely described in the following with reference to the accompanying drawings, and based on the embodiments of the present application, other similar embodiments obtained by those skilled in the art without making any inventive effort should be included in the scope of protection of the present application. In addition, directional words such as "upper", "lower", "left", "right", and the like, as used in the following embodiments are merely directions with reference to the drawings, and thus, the directional words used are intended to illustrate, not to limit, the application.
The application will be further described with reference to the drawings and preferred embodiments.
Referring to fig. 1-2, the present application provides a control system for suppressing an input impact current, comprising:
the control system includes:
the acquisition module 100 acquires direct-current voltages at two ends of the bus capacitor according to a first detection period;
the control module 200 is configured to determine whether the dc voltages at two ends of the bus capacitor C are smaller than a first preset threshold; or for controlling the operating state of the precharge circuit 300 and/or the powered device 400 according to the determination result;
the pre-charging circuit 300 is connected with the power grid 800 in an alternating current mode, and is used for inhibiting impact of starting current on the bus capacitor C when the bus capacitor C is just charged;
and the bus capacitor C is electrically connected with the electric equipment 400 and is used for providing electric energy for the operation of the electric equipment 400.
The control system further includes:
the PFC circuit 500 is preferably a BOOST type PFC circuit, and the PFC circuit 500 is configured to suppress harmonic pollution so as to BOOST a voltage on a bus and implement a power factor correction function in order to improve power supply quality of a power grid.
The control system further comprises a rectifying circuit 600, the rectifying circuit 600 being adapted to convert an ac power source into a dc power source.
The control system further comprises an inverter circuit 700, wherein the inverter circuit 700 is used for converting direct current into alternating current with adjustable frequency and amplitude, and the alternating current is supplied to electric equipment 400 such as a compressor or a fan for use.
It can be appreciated that the precharge circuit of the present application operates as follows: when a start-up instruction of the electric equipment 400 is received, the first relay K1 is attracted, the alternating current of the power grid 800 is converted into direct current through the current limiting resistor R and charged into the bus capacitor C by the rectifying circuit 600, after a period of time, the second relay K2 is attracted, the first relay K1 is disconnected, and the pre-charging process is ended. In the actual air conditioner use, if the power supply drops the voltage instantaneously but the direct current voltages at the two ends of the bus capacitor C do not drop below the protection value, and then the direct current voltages at the two ends of the bus capacitor C are recovered to be normal, the bus capacitor C will rise in a short timeAccording to the voltage-current relation of the capacitor>It can be seen that a larger capacitive current is instantaneously passed, and if the current exceeds the current tolerance value of the components in the circuit loop, the components are directly damaged, so that the driving main board of the electric device 400 cannot work normally.
In general, the protection value of the dc voltage at both ends of the bus capacitor C is fixed, and when the dc voltage at both ends of the bus capacitor C is higher, the voltage that can drop under the condition of not reporting a fault is higher, the voltage that the capacitor rises during recovery is higher, and the current flowing through the bus capacitor C is larger. When the application mainly solves the problem of different power grid voltages, the electric equipment 400 is preferably an air conditioner frequency converter when the electric equipment 400 is allowed to be regulated and controlled by the maximum capacitance current.
Specifically, the precharge circuit includes:
the power grid alternating current power supply device comprises a first relay K1, a second relay K2 and a current limiting resistor R, wherein one end of the first relay K1 is electrically connected with the input end of the power grid alternating current, one end of the current limiting resistor R at the other end of the first relay K1 is connected, the other end of the current limiting resistor R is electrically connected with a bus capacitor C, and the second relay K2 is connected in parallel with the two ends of the first relay K1 and the two ends of the current limiting resistor R.
It can be appreciated that the application provides a control system for inhibiting input impact current, when a power supply drops instantly but the direct current voltage at two ends of a bus capacitor C does not drop below a protection value and then the power supply is recovered to be normal, the precharge circuit 300 is controlled to start working, so that the input impact current is limited, the effect of protecting main board components is achieved, the occurrence of larger input impact current is avoided, the problem that the main board components are extremely damaged by the input impact current at the moment is solved, the power grid voltage abnormal fluctuation resistance capability of a frequency converter is enhanced, and the damage of a unit caused by overlarge input current is avoided.
Referring to fig. 3, another embodiment of the present application provides a control method for suppressing an input impact current, including:
s100, obtaining direct current voltages at two ends of a bus capacitor according to a first detection period.
Here, the step S100 includes, before:
the method comprises the steps of presetting a first detection period, a first preset threshold, a second preset threshold and a third preset threshold.
Here, the first detection period is a frequency period of the connected power grid.
Specifically, the method further comprises the following steps:
acquiring input voltage V of a power grid according to a first detection period IN The method comprises the steps of carrying out a first treatment on the surface of the According to the input voltage V of the power network IN Calculating the effective value U of the input voltage RMS Judging the effective value U of the input voltage RMS And controlling the working state of the pre-charging circuit and/or the electric equipment according to the judging result.
Specifically, the method further comprises the following steps:
obtaining a voltage maximum U of a power grid according to a first detection period MAX The first preset threshold and the second preset threshold are calculated by the following formula:
V1＝U MAX -ΔV；
V2＝U MAX -2ΔV；
wherein V1 is a third preset threshold, V2 is a first preset threshold, Δv is a maximum value of allowable changes of the dc grid bus voltage, and preferably Δv is a maximum value of allowable decreases of the dc grid bus voltage.
It should be noted that, the second preset threshold is preferably 100V, and the fact that the second preset threshold is preferably 100V is obtained by a person skilled in the art through a large number of experiments, so that the effective value U of the input voltage can be well determined RMS Whether it is too low.
Specifically, the controlling the working state of the precharge circuit and/or the electric equipment according to the judgment result further includes:
if the input voltage has an effective value U RMS And when the voltage is smaller than a second preset threshold value, the first relay and the second relay are controlled to be disconnected, and the electric equipment is controlled to stop running.
It should be noted that if the voltage of the power grid bus is detected to be lower than the first preset threshold value, or if the effective value of the input voltage is detected to be lower than the second preset threshold value, that is, the effective value of the input voltage is lower than 100V, this indicates that the direct current voltage drop at two ends of the power grid bus capacitor is too large due to the too large change of the power grid voltage or the uncontrolled loss of the PFC circuit, this indicates that the alternating current of the power grid may be already powered off at this time, and in both cases, the first relay and the second relay need to be controlled to be disconnected, and the electric equipment is controlled to stop.
S200, judging whether the direct current voltage at two ends of the bus capacitor is smaller than a first preset threshold value.
S300, controlling the working state of the pre-charging circuit and/or the electric equipment according to the judging result.
The outputting the working state related to the control of the pre-charging circuit and/or the working state of the electric equipment according to the judging result comprises the following steps:
and if the direct current voltage at the two ends of the bus capacitor is smaller than a first preset threshold value, the first relay and the second relay are controlled to be disconnected, and the electric equipment is controlled to stop running.
If the direct current voltage at the two ends of the bus capacitor is larger than or equal to a first preset threshold value, judging whether the direct current voltage at the two ends of the bus capacitor is larger than or equal to a third preset threshold value, and controlling the working state of the pre-charging circuit and/or the electric equipment according to the judging result.
Specifically, the controlling of the pre-charging circuit to be closed comprises controlling the first relay to be opened and controlling the second relay to be closed.
Specifically, the method further comprises the following steps:
if the direct current voltage at the two ends of the bus capacitor is smaller than a third preset threshold value and the effective value of the input voltage is larger than or equal to the second preset threshold value, controlling the electric equipment to operate according to the lowest operating frequency and controlling the pre-charging circuit to start;
and if the direct current voltage at the two ends of the bus capacitor is larger than or equal to a third preset threshold value, controlling the pre-charging circuit to be closed, and controlling the electric equipment to operate according to the frequency set by a user.
Specifically, the control of the pre-charging circuit to start comprises the control of the first relay to be closed and the control of the second relay to be opened.
Here, if the input voltage is the effective value U RMS And the voltage is higher than 100V, and the direct current voltage at the two ends of the bus capacitor C is detected to be smaller than a third preset threshold value and larger than or equal to a first preset threshold value, which means that the direct current voltage at the two ends of the bus capacitor C falls too much but is in a recoverable range. At the moment, electric equipment is required to be adjusted to the lowest operating frequency for operation, the electricity consumption of the current limiting resistor is reduced, meanwhile, the precharge circuit is started, namely, the first relay is closed, the second relay is opened, and when the direct-current voltage at the two ends of the bus capacitor C is recovered, the charging current of the bus capacitor passes through the current limiting resistor, so that the input impact current is limited, and the effect of protecting the components of the main board is achieved;
when the direct current voltage at the two ends of the bus capacitor C is recovered to be higher than a third preset threshold value, the pre-charging circuit is controlled to be closed, namely the current limiting resistor is short-circuited, namely the relay K1 is opened and the relay K2 is closed, and meanwhile the frequency of the compressor is adjusted to run according to the current set frequency.
The first preset threshold value and the third preset threshold value can be adjusted according to different hardware and different loads, so that the direct current voltage at the two ends of the bus capacitor C can be ensured to be fluctuated within the range, and the damage to components is avoided.
It can be understood that the application provides a control system for inhibiting input impact current, when the power supply drops instantly but the direct current voltage at two ends of the bus capacitor C does not drop below a protection value and then the power supply is recovered to be normal, the precharge circuit is controlled to start working, so that the input impact current is limited, the effect of protecting main board components is achieved, the larger input impact current is avoided, the problem that the main board components are damaged by the input impact current at the moment is solved, the power grid voltage abnormal fluctuation resistance capability of the frequency converter is enhanced, and the damage of a unit caused by overlarge input current is avoided.
In a preferred embodiment, the present application also provides an air conditioner, including:
a memory; and a processor, the memory having stored thereon computer readable instructions which, when executed by the processor, implement the control method for suppressing input rush current. The computer device may be broadly a server, a terminal, or any other electronic device having the necessary computing and/or processing capabilities. In one embodiment, the computer device may include a processor, memory, network interface, communication interface, etc. connected by a system bus. The processor of the computer device may be used to provide the necessary computing, processing and/or control capabilities. The memory of the computer device may include a non-volatile storage medium and an internal memory. The non-volatile storage medium may have an operating system, computer programs, etc. stored therein or thereon. The internal memory may provide an environment for the operation of the operating system and computer programs in the non-volatile storage media. The network interface and communication interface of the computer device may be used to connect and communicate with external devices via a network. Which when executed by a processor performs the steps of the method of the application.
The present application may be implemented as a computer readable storage medium having stored thereon a computer program which, when executed by a processor, causes steps of a method of an embodiment of the present application to be performed. In one embodiment, the computer program is distributed over a plurality of computer devices or processors coupled by a network such that the computer program is stored, accessed, and executed by one or more computer devices or processors in a distributed fashion. A single method step/operation, or two or more method steps/operations, may be performed by a single computer device or processor, or by two or more computer devices or processors. One or more method steps/operations may be performed by one or more computer devices or processors, and one or more other method steps/operations may be performed by one or more other computer devices or processors. One or more computer devices or processors may perform a single method step/operation or two or more method steps/operations.
Those of ordinary skill in the art will appreciate that the method steps of the present application may be implemented by a computer program, which may be stored on a non-transitory computer readable storage medium, to instruct related hardware such as a computer device or a processor, which when executed causes the steps of the present application to be performed. Any reference herein to memory, storage, database, or other medium may include non-volatile and/or volatile memory, as the case may be. Examples of nonvolatile memory include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), flash memory, magnetic tape, floppy disk, magneto-optical data storage, hard disk, solid state disk, and the like. Examples of volatile memory include Random Access Memory (RAM), external cache memory, and the like.
The technical features described above may be arbitrarily combined. Although not all possible combinations of features are described, any combination of features should be considered to be covered by the description provided that such combinations are not inconsistent.
The above-described embodiments of the present application do not limit the scope of the present application. Any other corresponding changes and modifications made in accordance with the technical idea of the present application shall be included in the scope of the claims of the present application.
Claims (10)
1. A control system for suppressing an input rush current, the control system comprising:
the acquisition module acquires direct-current voltages at two ends of the bus capacitor according to a first detection period;
the control module is used for judging whether the direct current voltage at two ends of the bus capacitor is smaller than a first preset threshold value or not; or the device is used for controlling the working state of the precharge circuit and/or the electric equipment according to the judging result;
the pre-charging circuit is connected with the power grid alternating current and used for inhibiting the impact of starting current on the bus capacitor when the bus capacitor is just charged;
and the bus capacitor is electrically connected with the electric equipment and is used for providing electric energy for the operation of the electric equipment.
2. The control system for suppressing an input rush current according to claim 1 wherein said precharge circuit comprises:
the power grid relay comprises a first relay, a second relay and a current limiting resistor, wherein one end of the first relay is electrically connected with the input end of the power grid alternating current, one end of the current limiting resistor at the other end of the first relay is connected, the other end of the current limiting resistor is electrically connected with a bus capacitor, and the second relay is connected in parallel with the two ends of the first relay and the two ends of the current limiting resistor.
3. A control method for suppressing an input rush current, comprising:
obtaining direct current voltages at two ends of a bus capacitor according to a first detection period;
judging whether the direct current voltage at two ends of the bus capacitor is smaller than a first preset threshold value or not;
and controlling the working state of the pre-charging circuit and/or the electric equipment according to the judging result.
4. A control method for suppressing an input rush current according to claim 3 wherein said outputting information regarding the operation state of the control precharge circuit and/or the operation state of the electric device based on the determination result comprises:
if the direct current voltage at the two ends of the bus capacitor is smaller than a first preset threshold value, the first relay and the second relay are controlled to be disconnected, and the electric equipment is controlled to stop running;
if the direct current voltage at the two ends of the bus capacitor is larger than or equal to a first preset threshold value, judging whether the direct current voltage at the two ends of the bus capacitor is larger than or equal to a third preset threshold value, and controlling the working state of the pre-charging circuit and/or the electric equipment according to the judging result.
5. A control method for suppressing an input rush current according to claim 3, wherein the method further comprises:
and acquiring the input voltage of the power grid according to the first detection period, calculating an effective value of the input voltage according to the input voltage of the power grid, judging whether the effective value of the input voltage is smaller than a second preset threshold value, and controlling the working state of the pre-charging circuit and/or the electric equipment according to a judgment result.
6. The control method for suppressing an input rush current according to claim 5, wherein controlling the operating state of the precharge circuit and/or the powered device according to the determination result further comprises:
if the effective value of the input voltage is smaller than a second preset threshold value, the first relay and the second relay are controlled to be disconnected, and the electric equipment is controlled to stop running.
7. The control method for suppressing an input rush current according to claim 5, wherein said method further comprises:
if the direct current voltage at the two ends of the bus capacitor is smaller than a third preset threshold value and the effective value of the input voltage is larger than or equal to the second preset threshold value, controlling the electric equipment to operate according to the lowest operating frequency and controlling the pre-charging circuit to start;
and if the direct current voltage at the two ends of the bus capacitor is larger than or equal to a third preset threshold value, controlling the pre-charging circuit to be closed, and controlling the electric equipment to operate according to the frequency set by a user.
8. The control method for suppressing an input rush current according to claim 7 wherein controlling activation of the precharge circuit includes controlling actuation of a first relay and controlling opening of a second relay.
9. The control method for suppressing an input rush current according to claim 7 wherein controlling the precharge circuit to close includes controlling the first relay to open and controlling the second relay to close.
10. An air conditioner, comprising:
a memory; and a processor having stored thereon computer readable instructions which when executed by the processor implement the control method for suppressing an input impact current according to any one of claims 3 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311035434.0A CN117175518A (en) | 2023-08-16 | 2023-08-16 | Control system and method for inhibiting input impact current and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311035434.0A CN117175518A (en) | 2023-08-16 | 2023-08-16 | Control system and method for inhibiting input impact current and air conditioner |
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|---|---|
| CN117175518A true CN117175518A (en) | 2023-12-05 |
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| CN202311035434.0A Pending CN117175518A (en) | 2023-08-16 | 2023-08-16 | Control system and method for inhibiting input impact current and air conditioner |
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| CN (1) | CN117175518A (en) |
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- 2023-08-16 CN CN202311035434.0A patent/CN117175518A/en active Pending
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