CN105071648B - The line voltage of air-conditioning system rises sharply countermeasure and device - Google Patents
The line voltage of air-conditioning system rises sharply countermeasure and device Download PDFInfo
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Abstract
Rise sharply countermeasure and device, the described method comprises the following steps the invention discloses a kind of line voltage of air-conditioning system：The input current Iin of pfc circuit is detected, and detects the input voltage Vbd of pfc circuit；Input voltage Vbd phase is obtained, and input voltage peak value, and phase and input voltage peak computational input voltage estimate Vest according to input voltage Vbd are calculated according to input voltage Vbd；Judge the voltage difference between input current Iin and input voltage Vbd and input voltage estimate Vest；If input current Iin is more than default maximum current Imax and voltage difference is more than default threshold pressure differential △ Vmax, the switching tube drive signal of pfc circuit is turned off, and turns off the power model drive signal of compressor.This method can effectively reduce the peak value of input current when line voltage rises sharply, and so as to reduce rush of current, improve the robustness of system.
Description
Technical field
The present invention relates to air-conditioning system technical field, more particularly to a kind of line voltage of air-conditioning system rises sharply countermeasure
And a kind of line voltage of air-conditioning system rises sharply and tackles device.
Background technology
In the similar systems such as domestic air conditioning, after the rectified bridge rectification of single phase alternating current power supply from power network, pass through PFC
(Power Factor Correction, PFC) circuit output direct current, with to big capacity electrolyte capacitor and load
(predominantly compressor) power supply.Typical BOOST types pfc circuit can not only reach higher power factor, and can rise
Pressure output steady dc voltage, so as to provide galvanic current source to load.
But when line voltage rises sharply, due to pfc circuit control lag so that tube current is switched in pfc circuit and is risen sharply
And input current overcurrent protection occurs, moreover, when line voltage is higher than DC bus-bar voltage, the charging current meeting of electrochemical capacitor
It is very big, after being superimposed with load current so that input current is easy to that over current fault occurs.
The content of the invention
It is contemplated that at least solves one of technical problem in correlation technique to a certain extent.Therefore, the present invention
One purpose is to propose a kind of power network electricity that can effectively reduce the air-conditioning system of input current peak value when line voltage rises sharply
Press the countermeasure that rises sharply.
It is another object of the present invention to propose that a kind of line voltage of air-conditioning system rises sharply to tackle device.
To reach above-mentioned purpose, one aspect of the present invention embodiment proposes a kind of line voltage of air-conditioning system and risen sharply reply
Method, the air-conditioning system include pfc circuit and are connected to the electrochemical capacitor and compressor of the pfc circuit output end, institute
The method of stating comprises the following steps：The input current Iin of the pfc circuit is detected, and detects the input voltage of the pfc circuit
Vbd；The phase of the input voltage Vbd is obtained, and according to input voltage Vbd calculating input voltage peak values, and according to
The phase of the input voltage Vbd and the input voltage peak computational input voltage estimate Vest；Judge the input electricity
Flow the voltage difference between the Iin and input voltage Vbd and input voltage estimate Vest；If the input current
Iin is more than default maximum current Imax and the voltage difference is more than default threshold pressure differential △ Vmax, then turns off the PFC
The switching tube drive signal of circuit, and turn off the power model drive signal of the compressor.
The line voltage of air-conditioning system according to embodiments of the present invention rises sharply countermeasure, first detection pfc circuit in real time
Input current Iin, and detect the input voltage Vbd of pfc circuit, then obtain input voltage Vbd phase, and according to input
Voltage Vbd calculates input voltage peak value, and is estimated according to input voltage Vbd phase and input voltage peak computational input voltage
Evaluation Vest, and it is more than default threshold pressure differential △ more than default maximum current Imax and voltage difference in input current Iin
During Vmax, the switching tube drive signal of pfc circuit is turned off, and turns off the power model drive signal of compressor, so as to effectively subtract
Input current amplitude when minor scale power net voltage rises sharply, and then rush of current is effectively reduced, improve the robustness of system.
According to one embodiment of present invention, if the input current Iin is more than the default maximum current Imax
And the voltage difference is less than or equal to the default threshold pressure differential △ Vmax, then the switching tube for turning off the pfc circuit drives
Dynamic signal, and keep the power model drive signal normally to export.
According to one embodiment of present invention, if the input current Iin is less than or equal to the default maximum electricity
Imax is flowed, then keeps the switching tube drive signal of the pfc circuit normally to export, and keep the power model drive signal just
Often output.
In some embodiments of the invention, phaselocked loop is used to track frequency and the phase of the input voltage Vbd to obtain
Take the phase Theta_est of the input voltage Vbd.
According to one embodiment of present invention, input voltage estimate is calculated according to below equation：
Vest=Vpeak × | sin (Theta_est) |
Wherein, Vest is the input voltage estimate, and Vpeak is the input voltage peak value, and Vpeak=Vavg ×
Pi/2, Vavg are input voltage average value, and Theta_est is the phase of the input voltage Vbd, wherein, pass through low pass filter
The input voltage Vbd is calculated to obtain the input voltage average value.
To reach above-mentioned purpose, another aspect of the present invention embodiment proposes that a kind of line voltage of air-conditioning system rises sharply should
To device, the air-conditioning system includes pfc circuit and is connected to the electrochemical capacitor and compressor of the pfc circuit output end,
Described device includes：Current detecting unit, for detecting the input current Iin of the pfc circuit；Voltage detection unit, it is used for
Detect the input voltage Vbd of the pfc circuit；Computing unit, for obtaining the phase of the input voltage Vbd, and according to institute
State input voltage Vbd and calculate input voltage peak value, and the phase according to the input voltage Vbd and the input voltage peak value
Calculate input voltage estimate Vest；Control unit, for judging the input current Iin and the input voltage Vbd and institute
The voltage difference between input voltage estimate Vest is stated, and is more than default maximum current Imax in the input current Iin
And the voltage difference, when being more than default threshold pressure differential △ Vmax, described control unit turns off the switching tube of the pfc circuit
Drive signal, and turn off the power model drive signal of the compressor.
The line voltage of air-conditioning system according to embodiments of the present invention, which rises sharply, tackles device, real-time by current detecting unit
The input current Iin of pfc circuit is detected, and detects the input voltage Vbd of pfc circuit in real time by voltage detection unit, is calculated
Unit obtains input voltage Vbd phase, and calculates input voltage peak value according to input voltage Vbd, and according to input voltage
Vbd phase and input voltage peak computational input voltage estimate Vest, control unit judge input current Iin and input electricity
The voltage difference between Vbd and input voltage estimate Vest is pressed, and is more than default maximum current Imax in input current Iin
And voltage difference, when being more than default threshold pressure differential △ Vmax, control unit turns off the switching tube drive signal of pfc circuit, and closes
The power model drive signal of disconnected compressor, so as to effectively reduce input current amplitude, Jin Eryou when line voltage rises sharply
Effect reduces rush of current, improves the robustness of system.
According to one embodiment of present invention, when the input current Iin be more than the default maximum current Imax and
When the voltage difference is less than or equal to the default threshold pressure differential △ Vmax, described control unit turns off the pfc circuit
Switching tube drive signal, and keep the power model drive signal normally to export.
According to one embodiment of present invention, when the input current Iin is less than or equal to the default maximum current
During Imax, described control unit keeps the switching tube drive signal of the pfc circuit normally to export, and keeps the power model
Drive signal normally exports.
In some embodiments of the invention, the computing unit tracks the frequency of the input voltage Vbd using phaselocked loop
Rate and phase are to obtain the phase Theta_est of the input voltage Vbd.
According to one embodiment of present invention, the computing unit calculates input voltage estimate according to below equation：
Vest=Vpeak × | sin (Theta_est) |
Wherein, Vest is the input voltage estimate, and Vpeak is the input voltage peak value, and Vpeak=Vavg ×
Pi/2, Vavg are input voltage average value, and Theta_est is the phase of the input voltage Vbd, wherein, the computing unit leads to
Low pass filter is crossed to calculate the input voltage Vbd to obtain the input voltage average value.
Brief description of the drawings
Fig. 1 is that the line voltage of air-conditioning system according to embodiments of the present invention rises sharply the flow chart of countermeasure.
Fig. 2 is electric current when switching tube turns in pfc circuit under continuous current mode according to an embodiment of the invention
Flow graph.
Fig. 3 is electric current when switching tube turns off in pfc circuit under continuous current mode according to an embodiment of the invention
Flow graph.
Fig. 4 is input current waveform figure according to an embodiment of the invention.
Fig. 5 is that the line voltage for not using the embodiment of the present invention rises sharply the input current waveform figure of countermeasure.
Fig. 6 be the line voltage of air-conditioning system according to embodiments of the present invention rise sharply reply device block diagram.
Reference：Current detecting unit 10, voltage detection unit 20, computing unit 30 and control unit 40.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
The line voltage for the air-conditioning system for describing to propose according to embodiments of the present invention with reference to the accompanying drawings rises sharply countermeasure
And the line voltage of air-conditioning system rises sharply and tackles device.
Fig. 1 is that the line voltage of air-conditioning system according to embodiments of the present invention rises sharply the flow chart of countermeasure, wherein, such as
Shown in Fig. 2 or Fig. 3, air-conditioning system includes pfc circuit and is connected to the electrochemical capacitor and compressor of pfc circuit output end.
Specifically, as shown in Figures 2 and 3, pfc circuit is BOOST type pfc circuits, and it mainly includes inductance, fast recovery
Diode and switching tube.Wherein, under continuous current mode, as shown in Fig. 2 it is in the conduction state to work as switching tube in pfc circuit
When, input voltage Vbd is risen by switching tube to induction charging, input current Iin, meanwhile, electrochemical capacitor is powered to compressor,
DC bus-bar voltage (voltages at electrochemical capacitor both ends) Vdc declines；As shown in figure 3, working as switching tube in pfc circuit is off shape
During state, input voltage Vbd is charged by inductance and fast recovery diode to electrochemical capacitor, while is powered to compressor, input electricity
Flow Iin to decline, DC bus-bar voltage Vdc rises.By switching tube drive signal come the turn-on and turn-off of controlling switch pipe, with reality
Existing PFC and DC bus-bar voltage Vdc regulation.
Because BOOST types pfc circuit only has boost function, therefore, generally, input voltage Vbd is all without height
In DC bus-bar voltage Vdc, and when input voltage Vbd is higher than DC bus-bar voltage Vdc, show that pfc circuit fails.For example,
When input voltage Vbd rises sharply, it may appear that input voltage Vbd is higher than DC bus-bar voltage Vdc situation, now, Fig. 2 institutes
Input current Iin during the switching tube conducting shown rises quickly；Input current Iin when switching tube shown in Fig. 3 turns off will not
Decline rises on the contrary, while being powered to compressor, gives electrochemical capacitor quick charge, until input voltage Vbd is not higher than straight
Flow busbar voltage Vdc.During input voltage Vbd rises sharply, input current peak value can be higher than normal operating current, still
Duration is very short, typically within 5ms.
In order to ensure that system can resist the risk that input voltage Vbd rises sharply, line voltage need to be reduced as far as possible and risen sharply
Input current peak value in journey.It can be seen from above-mentioned analysis, the main way of input current peak value during line voltage rises sharply is reduced
Footpath has：(1) switching tube drive signal in pfc circuit is turned off, avoids making input current Iin because of switching tube conducting in pfc circuit
Rise quickly；(2) system load power, during so that the switching tube in pfc circuit being off state, input current Iin are reduced
It need not power to load such as compressor, and need to only be charged to electrochemical capacitor, so as to reach the purpose for reducing input current peak value.
As shown in figure 1, the line voltage of air-conditioning system rises sharply, countermeasure comprises the following steps：
S1, detects the input current Iin of pfc circuit, and detects the input voltage Vbd of pfc circuit.It is for instance possible to use
Shunt resistance method detects input current Iin, and input voltage Vbd is detected using electric resistance partial pressure method.
S2, input voltage Vbd phase is obtained, and input voltage peak value is calculated according to input voltage Vbd, and according to defeated
Enter voltage Vbd phase and input voltage peak computational input voltage estimate Vest.
In some embodiments of the invention, use phaselocked loop tracking input voltage Vbd frequency and phase defeated to obtain
Enter voltage Vbd phase Theta_est.Wherein, the bandwidth of phaselocked loop is less than input voltage Vbd frequency, for example, when input electricity
When pressing Vbd frequency to be 50Hz, the bandwidth of phaselocked loop can be 5Hz.
According to one embodiment of present invention, input voltage estimate is calculated according to following formula (1)：
Vest=Vpeak × | sin (Theta_est) | (1)
Wherein, Vest is input voltage estimate, and Vpeak is input voltage peak value, and Vpeak=Vavg × pi/2, Vavg
For input voltage average value, Theta_est is input voltage Vbd phase, wherein, by low pass filter to input voltage
Vbd is calculated to obtain input voltage average value.
S3, judge the voltage difference between input current Iin and input voltage Vbd and input voltage estimate Vest.
S4, if input current Iin is more than default maximum current Imax and voltage difference is more than default threshold pressure differential
△ Vmax, then turn off the switching tube drive signal of pfc circuit, and turns off the power model drive signal of compressor.
Wherein, default maximum current Imax is set according to the conveyance capacity of switching tube in pfc circuit, ensures switch pipe range
Time service is without being damaged, for example, when the conveyance capacity of switching tube in pfc circuit is 30A, default maximum current
Imax can be set as 28A, in addition, threshold pressure differential △ Vmax are according to input voltage measurement noise and input voltage estimate Vest
Between voltage difference setting, ensure threshold pressure differential △ Vmax be not less than input voltage measurement noise and input voltage estimate
Voltage difference between Vest, for example, threshold pressure differential △ Vmax can be set as 10V.
According to one embodiment of present invention, if input current Iin is more than default maximum current Imax and voltage difference
Value is less than or equal to default threshold pressure differential △ Vmax, then turns off the switching tube drive signal of pfc circuit, and keeps power model
Drive signal normally exports.
According to one embodiment of present invention, if input current Iin is less than or equal to default maximum current Imax,
Keep the switching tube drive signal of pfc circuit normally to export, and keep power model drive signal normally to export.
Specifically, in order to realize line voltage rise sharply during suppression to input current, need monitoring input in real time first
Whether voltage Vbd rises sharply, if directly judged by input voltage Vbd and DC bus-bar voltage Vdc magnitude relationship,
The shortcomings that hysteresis then be present, therefore, in an embodiment of the present invention, phaselocked loop tracking input voltage Vbd frequency can be used
With phase to obtain input voltage Vbd phase Theta_est, and according to the input voltage Vbd of detection, pass through above-mentioned formula
(1) calculate input voltage estimate Vest, by the voltage difference between input voltage Vbd and input voltage estimate Vest and
Threshold pressure differential △ Vmax magnitude relationship judges whether input voltage Vbd rises sharply.
When input current Iin is more than default threshold pressure differential △ more than default maximum current Imax and voltage difference
Vmax, then turn off the switching tube drive signal of pfc circuit, and turns off the power model drive signal of compressor；Work as input current
Iin is more than default maximum current Imax and voltage difference is less than or equal to default threshold pressure differential △ Vmax, then turns off PFC electricity
The switching tube drive signal on road, and keep power model drive signal normally to export；Preset when input current Iin is less than or equal to
Maximum current Imax, then keep the switching tube drive signal of pfc circuit normally to export, and keep power model drive signal just
Often output, as shown in table 1.
Table 1
Fig. 4 is input current waveform figure according to an embodiment of the invention, and Fig. 5 is the electricity for not using the embodiment of the present invention
The input current waveform figure of net voltage swells countermeasure.It was found from Fig. 4 and Fig. 5 contrasts, pass through the power network of the embodiment of the present invention
Voltage swells countermeasure can effectively reduce the amplitude of input current when line voltage rises sharply, so as to effectively reduce rushing for electric current
Hit, improve the robustness of system.
In summary, the line voltage of air-conditioning system according to embodiments of the present invention rises sharply countermeasure, first inspection in real time
The input current Iin of pfc circuit is surveyed, and detects the input voltage Vbd of pfc circuit, then obtains input voltage Vbd phase,
And input voltage peak value, and phase and input voltage peak computational according to input voltage Vbd are calculated according to input voltage Vbd
Input voltage estimate Vest, and input current Iin be more than default maximum current Imax and voltage difference be more than it is default
During threshold pressure differential △ Vmax, the switching tube drive signal of pfc circuit is turned off, and turns off the power model drive signal of compressor,
So as to effectively reduce input current amplitude when line voltage rises sharply, and then rush of current is effectively reduced, improve the Shandong of system
Rod.
Fig. 6 be the line voltage of air-conditioning system according to embodiments of the present invention rise sharply reply device block diagram.Its
In, air-conditioning system includes pfc circuit and is connected to the electrochemical capacitor and compressor of pfc circuit output end.
Specifically, as shown in Figures 2 and 3, pfc circuit is BOOST type pfc circuits, and it mainly includes inductance, fast recovery
Diode and switching tube.Wherein, under continuous current mode, as shown in Fig. 2 it is in the conduction state to work as switching tube in pfc circuit
When, input voltage Vbd is risen by switching tube to induction charging, input current Iin, meanwhile, electrochemical capacitor is powered to compressor,
DC bus-bar voltage (voltages at electrochemical capacitor both ends) Vdc declines；As shown in figure 3, working as switching tube in pfc circuit is off shape
During state, input voltage Vbd is charged by inductance and fast recovery diode to electrochemical capacitor, while is powered to compressor, input electricity
Flow Iin to decline, DC bus-bar voltage Vdc rises.By switching tube drive signal come the turn-on and turn-off of controlling switch pipe, with reality
Existing PFC and DC bus-bar voltage Vdc regulation.
Because BOOST types pfc circuit only has boost function, therefore, generally, input voltage Vbd is all without height
In DC bus-bar voltage Vdc, and when input voltage Vbd is higher than DC bus-bar voltage Vdc, show that pfc circuit fails.For example,
When input voltage Vbd rises sharply, it may appear that input voltage Vbd is higher than DC bus-bar voltage Vdc situation, now, Fig. 2 institutes
Input current Iin during the switching tube conducting shown rises quickly；Input current Iin when switching tube shown in Fig. 3 turns off will not
Decline rises on the contrary, while being powered to compressor, gives electrochemical capacitor quick charge, until input voltage Vbd is not higher than straight
Flow busbar voltage Vdc.During input voltage Vbd rises sharply, input current peak value can be higher than normal operating current, still
Duration is very short, typically within 5ms.
In order to ensure that system can resist the risk that input voltage Vbd rises sharply, line voltage need to be reduced as far as possible and risen sharply
Input current peak value in journey.It can be seen from above-mentioned analysis, the main way of input current peak value during line voltage rises sharply is reduced
Footpath has：(1) switching tube drive signal in pfc circuit is turned off, avoids making input current Iin because of switching tube conducting in pfc circuit
Rise quickly；(2) system load power, during so that the switching tube in pfc circuit being off state, input current Iin are reduced
It need not power to load such as compressor, and need to only be charged to electrochemical capacitor, so as to reach the purpose for reducing input current peak value.
As shown in fig. 6, the line voltage of air-conditioning system rises sharply, reply device includes：Current detecting unit 10, voltage detecting
Unit 20, computing unit 30 and control unit 40.
Wherein, current detecting unit 10 is used for the input current Iin for detecting pfc circuit, and voltage detection unit 20 is used to examine
Survey the input voltage Vbd of pfc circuit.Computing unit 30 is used for the phase for obtaining input voltage Vbd, and according to input voltage Vbd
Calculate input voltage peak value, and phase and input voltage peak computational input voltage estimate according to input voltage Vbd
Vest.Control unit 40 is used to judge the voltage between input current Iin and input voltage Vbd and input voltage estimate Vest
Difference, and it is more than default threshold pressure differential △ Vmax more than default maximum current Imax and voltage difference in input current Iin
When, control unit 40 turns off the switching tube drive signal of pfc circuit, and turns off the power model drive signal of compressor.
According to one embodiment of present invention, when input current Iin is more than default maximum current Imax and voltage difference
During less than or equal to default threshold pressure differential △ Vmax, control unit 40 turns off the switching tube drive signal of pfc circuit, and keeps
Power model drive signal normally exports.
According to one embodiment of present invention, when input current Iin is less than or equal to default maximum current Imax, control
Unit 40 processed keeps the switching tube drive signal of pfc circuit normally to export, and keeps power model drive signal normally to export.
Wherein, default maximum current Imax is set according to the conveyance capacity of switching tube in pfc circuit, ensures switch pipe range
Time service is without being damaged, for example, when the conveyance capacity of switching tube in pfc circuit is 30A, default maximum current
Imax can be set as 28A, in addition, threshold pressure differential △ Vmax are according to input voltage measurement noise and input voltage estimate Vest
Between voltage difference setting, ensure threshold pressure differential △ Vmax be not less than input voltage measurement noise and input voltage estimate
Voltage difference between Vest, for example, threshold pressure differential △ Vmax can be set as 10V.
In some embodiments of the invention, computing unit 30 tracks input voltage Vbd frequency and phase using phaselocked loop
Position is to obtain input voltage Vbd phase Theta_est.Wherein, the bandwidth of phaselocked loop is less than input voltage Vbd frequency, example
Such as, when input voltage Vbd frequency is 50Hz, the bandwidth of phaselocked loop can be 5Hz.Computing unit 30 is according to above-mentioned formula
(1) input voltage estimate is calculated.
Specifically, in order to realize line voltage rise sharply during suppression to input current, need monitoring input in real time first
Whether voltage Vbd rises sharply, if directly judged by input voltage Vbd and DC bus-bar voltage Vdc magnitude relationship,
The shortcomings that hysteresis then be present, therefore, in an embodiment of the present invention, computing unit 30 can use phaselocked loop tracking input voltage
Vbd frequency and phase, according to the input voltage Vbd of detection, is passed through with obtaining input voltage Vbd phase Theta_est
Above-mentioned formula (1) calculates input voltage estimate Vest, passes through the electricity between input voltage Vbd and input voltage estimate Vest
Pressure difference and threshold pressure differential △ Vmax magnitude relationship judges whether input voltage Vbd rises sharply.
When the input current Iin that current detecting unit 10 detects is more than more than default maximum current Imax and voltage difference
Default threshold pressure differential △ Vmax, then control unit 40 turns off the switching tube drive signal of pfc circuit, and turns off the work(of compressor
Rate module driving signal；When the input current Iin that current detecting unit 10 detects is more than default maximum current Imax and voltage
Difference is less than or equal to default threshold pressure differential △ Vmax, then control unit 40 turns off the switching tube drive signal of pfc circuit, and
Power model drive signal is kept normally to export；Preset when the input current Iin that current detecting unit 10 detects is less than or equal to
Maximum current Imax, then control unit 40 keep the switching tube drive signal of pfc circuit normally to export, and keep power model
Drive signal normally exports, as shown in table 1.
Fig. 4 is input current waveform figure according to an embodiment of the invention, and Fig. 5 is the electricity for not using the embodiment of the present invention
The input current waveform figure of net voltage swells countermeasure.It was found from Fig. 4 and Fig. 5 contrasts, pass through the power network of the embodiment of the present invention
Voltage swells reply device can effectively reduce the amplitude of input current when line voltage rises sharply, so as to effectively reduce rushing for electric current
Hit, improve the robustness of system.
The line voltage of air-conditioning system according to embodiments of the present invention, which rises sharply, tackles device, real-time by current detecting unit
The input current Iin of pfc circuit is detected, and detects the input voltage Vbd of pfc circuit in real time by voltage detection unit, is calculated
Unit obtains input voltage Vbd phase, and calculates input voltage peak value according to input voltage Vbd, and according to input voltage
Vbd phase and input voltage peak computational input voltage estimate Vest, control unit judge input current Iin and input electricity
The voltage difference between Vbd and input voltage estimate Vest is pressed, and is more than default maximum current Imax in input current Iin
And voltage difference, when being more than default threshold pressure differential △ Vmax, control unit turns off the switching tube drive signal of pfc circuit, and closes
The power model drive signal of disconnected compressor, so as to effectively reduce input current amplitude, Jin Eryou when line voltage rises sharply
Effect reduces rush of current, improves the robustness of system.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " up time
The orientation or position relationship of the instruction such as pin ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " be based on orientation shown in the drawings or
Position relationship, it is for only for ease of and describes the present invention and simplify description, rather than indicates or imply that signified device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the invention, " multiple " are meant that at least two, such as two, three
It is individual etc., unless otherwise specifically defined.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be that machinery connects
Connect or electrically connect；Can be joined directly together, can also be indirectly connected by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements, limited unless otherwise clear and definite.For one of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature can be with "above" or "below" second feature
It is that the first and second features directly contact, or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature are directly over second feature or oblique upper, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height and is less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office
Combined in an appropriate manner in one or more embodiments or example.In addition, in the case of not conflicting, the skill of this area
Art personnel can be tied the different embodiments or example and the feature of different embodiments or example described in this specification
Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changed, replacing and modification.
Claims (8)
- The countermeasure 1. a kind of line voltage of air-conditioning system rises sharply, it is characterised in that the air-conditioning system include pfc circuit with And the electrochemical capacitor and compressor of the pfc circuit output end are connected to, it the described method comprises the following steps：The input current Iin of the pfc circuit is detected, and detects the input voltage Vbd of the pfc circuit；The phase of the input voltage Vbd is obtained, and according to input voltage Vbd calculating input voltage peak values, and according to The phase of the input voltage Vbd and the input voltage peak computational input voltage estimate Vest, wherein, according to following public affairs Formula calculates input voltage estimate：Vest=Vpeak × | sin (Theta_est) |Wherein, Vest is the input voltage estimate, and Vpeak is the input voltage peak value, and Vpeak=Vavg × pi/2, Vavg is input voltage average value, and Theta_est is the phase of the input voltage Vbd, wherein, by low pass filter to institute Input voltage Vbd is stated to be calculated to obtain the input voltage average value；Judge the voltage difference between the input current Iin and the input voltage Vbd and the input voltage estimate Vest Value；If the input current Iin is more than default maximum current Imax and the voltage difference is more than default threshold pressure differential △ Vmax, then turn off the switching tube drive signal of the pfc circuit, and turns off the power model drive signal of the compressor.
- 2. according to the method for claim 1, it is characterised in that if the input current Iin be more than it is described it is default most The high current Imax and voltage difference is less than or equal to the default threshold pressure differential △ Vmax, then turn off the pfc circuit Switching tube drive signal, and keep the power model drive signal normally to export.
- 3. method according to claim 1 or 2, it is characterised in that if the input current Iin is less than or equal to described Default maximum current Imax, then keep the switching tube drive signal of the pfc circuit normally to export, and keep the power mould Block drive signal normally exports.
- 4. according to the method for claim 1, it is characterised in that the frequency of the input voltage Vbd is tracked using phaselocked loop With phase to obtain the phase Theta_est of the input voltage Vbd.
- 5. a kind of line voltage of air-conditioning system rise sharply reply device, it is characterised in that the air-conditioning system include pfc circuit with And the electrochemical capacitor and compressor of the pfc circuit output end are connected to, described device includes：Current detecting unit, for detecting the input current Iin of the pfc circuit；Voltage detection unit, for detecting the input voltage Vbd of the pfc circuit；Computing unit, input voltage is calculated for obtaining the phase of the input voltage Vbd, and according to the input voltage Vbd Peak value, and the phase according to the input voltage Vbd and the input voltage peak computational input voltage estimate Vest, institute State computing unit and input voltage estimate is calculated according to below equation：Vest=Vpeak × | sin (Theta_est) |Wherein, Vest is the input voltage estimate, and Vpeak is the input voltage peak value, and Vpeak=Vavg × pi/2, Vavg is input voltage average value, and Theta_est is the phase of the input voltage Vbd, wherein, the computing unit passes through low Bandpass filter is calculated the input voltage Vbd to obtain the input voltage average value；Control unit, for judging the input current Iin and input voltage Vbd and the input voltage estimate Vest Between voltage difference, and the input current Iin be more than default maximum current Imax and the voltage difference be more than it is pre- If threshold pressure differential △ Vmax when, described control unit turns off the switching tube drive signal of the pfc circuit, and turns off the pressure The power model drive signal of contracting machine.
- 6. device according to claim 5, it is characterised in that when the input current Iin is more than the default maximum Electric current Imax and when the voltage difference is less than or equal to the default threshold pressure differential △ Vmax, described control unit shut-off institute The switching tube drive signal of pfc circuit is stated, and keeps the power model drive signal normally to export.
- 7. the device according to claim 5 or 6, it is characterised in that when the input current Iin is less than or equal to described pre- If maximum current Imax when, described control unit keeps the switching tube drive signal of the pfc circuit normally to export, and keeps The power model drive signal normally exports.
- 8. device according to claim 5, it is characterised in that the computing unit is using the phaselocked loop tracking input electricity Press Vbd frequency and phase to obtain the phase Theta_est of the input voltage Vbd.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105911416B (en) * | 2016-05-27 | 2019-05-31 | 广东美的制冷设备有限公司 | The method for diagnosing faults and device of PFC pfc circuit |
| CN106705368B (en) * | 2016-12-30 | 2019-07-30 | 美的集团股份有限公司 | Prejudge the method, apparatus and household electrical appliance of household electrical appliance failure |
| CN106918121A (en) * | 2017-03-31 | 2017-07-04 | 广东美的制冷设备有限公司 | Air-conditioner and its control method and device |
| CN112019023B (en) * | 2019-05-31 | 2021-11-02 | 广东美的制冷设备有限公司 | Drive control method, device, household appliance and computer readable storage medium |
| CN113726194B (en) * | 2021-07-21 | 2023-08-08 | 广东电网有限责任公司广州供电局 | Power conversion circuit and low-voltage direct-current power supply |
| CN114069573B (en) * | 2021-11-05 | 2024-03-01 | 青岛海信日立空调***有限公司 | Air conditioner |
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| US7095215B2 (en) * | 2004-06-04 | 2006-08-22 | Astec International Limited | Real-time voltage detection and protection circuit for PFC boost converters |
| CN202167837U (en) * | 2011-08-11 | 2012-03-14 | 海信（山东）空调有限公司 | PFC (Power Factor Correction) overcurrent protection circuit and air conditioner using same |
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| US7095215B2 (en) * | 2004-06-04 | 2006-08-22 | Astec International Limited | Real-time voltage detection and protection circuit for PFC boost converters |
| CN202167837U (en) * | 2011-08-11 | 2012-03-14 | 海信（山东）空调有限公司 | PFC (Power Factor Correction) overcurrent protection circuit and air conditioner using same |
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