CN104967301B - Voltage swells protective device, the method for pfc circuit in frequency-conversion domestic electric appliances equipment - Google Patents
Voltage swells protective device, the method for pfc circuit in frequency-conversion domestic electric appliances equipment Download PDFInfo
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- CN104967301B CN104967301B CN201510288920.2A CN201510288920A CN104967301B CN 104967301 B CN104967301 B CN 104967301B CN 201510288920 A CN201510288920 A CN 201510288920A CN 104967301 B CN104967301 B CN 104967301B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a kind of voltage swells protective devices for pfc circuit in frequency-conversion domestic electric appliances equipment, including：First voltage detection module, the input voltage for detecting pfc circuit；Current detection module, the input current for detecting pfc circuit；Second voltage detection module, the output voltage for detecting pfc circuit；Protection module; for being compared to input voltage and output voltage to generate the first comparison result; and input current and preset maximum allowed current are compared to generate the second comparison result; and pfc circuit is controlled by PFC control module respectively with the second comparison result according to the first comparison result, and motor is controlled by electric machine controller.The protective device can ensure that pfc circuit is without damage in voltage swells, while ensure not shutting down operation.The invention also discloses a kind of voltage swells guard methods for pfc circuit in frequency-conversion domestic electric appliances equipment.
Description
Technical field
The present invention relates to air-conditioning system technical fields, more particularly to a kind of for PFC (Power in frequency-conversion domestic electric appliances equipment
Factor Correction, PFC) circuit voltage swells protective device and a kind of being used for frequency-conversion domestic electric appliances equipment
The voltage swells guard method of middle pfc circuit.
Background technology
Frequency conversion is increasingly becoming the trend of household appliance, especially air-conditioning, refrigerator and washing machine etc., can by converter technique
The electricity consumption of household appliance is greatly saved, and has many advantages, such as low noise and high-performance.
Since frequency conversion needs direct current supply, and the alternating current that general alternating current is 220V, therefore, it is necessary to by rectification circuit and
Alternating current is changed into direct current with powering load by booster circuit.In addition, being generated to reduce in household appliance operational process
Current harmonics and reactive power, generally use pfc circuit meet boost function and power factor emendation function.
In frequency-conversion domestic electric appliances equipment, pfc circuit is usually Boost type pfc circuit, which includes mainly inductance, fast extensive
Multiple diode and device for power switching, wherein device for power switching is the weight for realizing boost function and power factor emendation function
Want device.And device for power switching be connected when electric current it is excessive or shutdown when voltage it is excessive, be all easy to cause power switch device
Part damages, and therefore, it is necessary to be protected to it.
And there are many reason of causing device for power switching overvoltage or overcurrent, for example, the quality of power supply used is exactly it
In an importance.When the voltage generation disturbance (supply voltage instantaneously falls or rises suddenly) of power supply used such as alternating current, or
Person's software control algorithm is unreasonable or handling can all cause device for power switching that overcurrent or overvoltage occurs not in time (low-response), from
And device for power switching is caused to damage.
In the related technology, load supplying is disconnected to protect device for power switching by directly opening defencive function.But
This method is for end power grid or distributed power grid, such as small towns and rural power grids, since network voltage is unstable and disturbance is frequent,
Household appliance is difficult normal table work, especially frequency-conversion domestic electric appliances equipment, it is easy to frequent start-stop is in the presence of, both not have
The effect for saving electricity, also greatly affected comfort and the experience of user.
Invention content
The present invention is directed to solve at least some of the technical problems in related technologies.
For this purpose, an object of the present invention is to provide a kind of voltage swells for pfc circuit in frequency-conversion domestic electric appliances equipment
Protective device can ensure that pfc circuit is without damage in voltage swells, while ensure that frequency-conversion domestic electric appliances equipment does not shut down operation.
It is another object of the present invention to propose a kind of voltage swells protection for pfc circuit in frequency-conversion domestic electric appliances equipment
Method.
In order to achieve the above objectives, one aspect of the present invention embodiment proposes a kind of for pfc circuit in frequency-conversion domestic electric appliances equipment
Voltage swells protective device, the frequency-conversion domestic electric appliances equipment includes that the pfc circuit, the control pfc circuit open and close
PFC control module, motor, electric machine controller, the voltage swells protective device includes：First voltage detection module, it is described
First voltage detection module is used to detect the input voltage of the pfc circuit；Current detection module, the current detection module are used
In the input current for detecting the pfc circuit；Second voltage detection module, the second voltage detection module are described for detecting
The output voltage of pfc circuit；And protection module, the protection module respectively with the first voltage detection module, the electricity
Stream detection module, the second voltage detection module, the PFC control module are connected with the electric machine controller, the protection
Module is for being compared the input voltage and the output voltage to generate the first comparison result, and to input electricity
Stream and preset maximum allowed current are compared to generate the second comparison result, and according to first comparison result and institute
The second comparison result is stated to carry out control to the pfc circuit by the PFC control module respectively and control by the motor
Device controls the motor.
Voltage swells protective device according to the ... of the embodiment of the present invention for pfc circuit in frequency-conversion domestic electric appliances equipment, by the
One voltage detection module detects the input voltage of pfc circuit, and the input current of pfc circuit is detected by current detection module,
And the output voltage of pfc circuit is detected by second voltage detection module, protection module to input voltage and output voltage into
Row is compared input current and preset maximum allowed current relatively to generate the first comparison result to generate the second ratio
Compared with as a result, and being controlled respectively pfc circuit by PFC control module with the second comparison result according to the first comparison result
Motor is controlled with by electric machine controller, to effectively pfc circuit be avoided to damage in voltage swells, and is protected
Card motor does not shut down work, improves the reliability and user experience of frequency-conversion domestic electric appliances equipment.
According to one embodiment of present invention, when the input voltage is greater than or equal to the output voltage and the input
When electric current is greater than or equal to the preset maximum allowed current, the protection module exports the first protection signal to the PFC
Control module so that the PFC control module controls the pfc circuit and closes, and exports the second protection signal to the motor
Controller, so that the electric machine controller controls the motor frequency reducing operation.
According to one embodiment of present invention, when the input voltage is greater than or equal to the output voltage and the input
When electric current is less than the preset maximum allowed current, the protection module exports the first protection signal to PFC control moulds
Block so that the PFC control module closes the pfc circuit, and controls the motor according to pre- by the electric machine controller
If frequency normal operation or the operation of frequency reducing in advance.
According to one embodiment of present invention, when the input voltage is less than the output voltage and the input current is big
When the preset maximum allowed current, the protection module exports the first protection signal to PFC control moulds
Block so that the PFC control module controls the pfc circuit and closes, and exports the second protection signal to the electric machine controller,
So that the electric machine controller controls the motor frequency reducing operation.
According to one embodiment of present invention, when the input voltage is less than the output voltage and the input current is small
When the preset maximum allowed current, the PFC control module controls the pfc circuit and opens, the electric machine controller
The motor is controlled according to predeterminated frequency normal operation.
In order to achieve the above objectives, another aspect of the present invention embodiment proposes a kind of for PFC electricity in frequency-conversion domestic electric appliances equipment
The voltage swells guard method on road, the frequency-conversion domestic electric appliances equipment includes the pfc circuit, the control pfc circuit is opened and pass
The PFC control module closed, motor, electric machine controller, the voltage swells guard method include the following steps：Detect the PFC
The input voltage of circuit, and detect the input current of the pfc circuit；Detect the output voltage of the pfc circuit；And to institute
State input voltage and the output voltage be compared to generate the first comparison result, and to the input current and it is preset most
It is big that electric current is allowed to be compared to generate the second comparison result, and knot is compared according to first comparison result and described second
Fruit carries out control and by the electric machine controller to the motor by the PFC control module to the pfc circuit respectively
It is controlled.
Voltage swells guard method according to the ... of the embodiment of the present invention for pfc circuit in frequency-conversion domestic electric appliances equipment is examined first
The input voltage of pfc circuit is surveyed, and detects the input current of pfc circuit and detects the output voltage of pfc circuit, then to defeated
Enter voltage and output voltage be compared to generate the first comparison result, and to input current and preset maximum allowed current into
Row is relatively to generate the second comparison result, and controls mould by PFC respectively with the second comparison result according to the first comparison result
Block carries out control to pfc circuit and is controlled motor by electric machine controller, to can effectively be kept away in voltage swells
Exempt from pfc circuit damage, and ensure that motor does not shut down work, improves the reliability and user experience of frequency-conversion domestic electric appliances equipment.
According to one embodiment of present invention, when the input voltage is greater than or equal to the output voltage and the input
When electric current is greater than or equal to the preset maximum allowed current, the first protection signal is exported to the PFC control module, so that
The PFC control module controls the pfc circuit and closes, and exports the second protection signal to the electric machine controller, so that institute
It states electric machine controller and controls the motor frequency reducing operation.
According to one embodiment of present invention, when the input voltage is greater than or equal to the output voltage and the input
When electric current is less than the preset maximum allowed current, the first protection signal of output is to the PFC control module, so that described
PFC control module closes the pfc circuit, and the electric machine controller controls the motor according to predeterminated frequency normal operation
Or the operation of frequency reducing in advance.
According to one embodiment of present invention, when the input voltage is less than the output voltage and the input current is big
When the preset maximum allowed current, the first protection signal of output is to the PFC control module, so that described
PFC control module controls the pfc circuit and closes, and exports the second protection signal to the electric machine controller, so that the electricity
Machine controller controls the motor frequency reducing operation.
According to one embodiment of present invention, when the input voltage is less than the output voltage and the input current is small
When the preset maximum allowed current, the PFC control module controls the pfc circuit and opens, the electric machine controller
The motor is controlled according to predeterminated frequency normal operation.
Description of the drawings
Fig. 1 is according to the embodiment of the present invention for the voltage swells protective device of pfc circuit in frequency-conversion domestic electric appliances equipment
Block diagram；
Fig. 2 is device for power switching IGBT (the Insulated Gate Bipolar according to one embodiment of the present of invention
Transistor, insulated gate bipolar transistor) conducting when equivalent circuit diagram；
Equivalent circuit diagram when Fig. 3 is the device for power switching IGBT shutdowns according to one embodiment of the present of invention；
Input when Fig. 4 input voltages according to an embodiment of the invention are less than output voltage in one switch periods
The oscillogram of electric current；
Fig. 5 is the voltage and current waveform according to pfc circuit under the normal condition of one embodiment of the present of invention；
When Fig. 6 input voltages according to an embodiment of the invention are greater than or equal to output voltage in one switch periods
Input current oscillogram；
The voltage current waveform of pfc circuit when Fig. 7 is the voltage swells according to the FPC circuits of one embodiment of the present of invention
Figure；
It is protected when Fig. 8 is the voltage swells according to the FPC circuits of one embodiment of the present of invention and by voltage swells and is filled
Set the voltage and current waveform of the pfc circuit after protection；And
Fig. 9 is according to the embodiment of the present invention for the voltage swells guard method of pfc circuit in frequency-conversion domestic electric appliances equipment
Flow chart.
Specific implementation mode
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.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 electricity for pfc circuit in frequency-conversion domestic electric appliances equipment to describe to propose according to embodiments of the present invention with reference to the accompanying drawings
Press rise sharply protective device and the voltage swells guard method for pfc circuit in frequency-conversion domestic electric appliances equipment.
Fig. 1 is according to the embodiment of the present invention for the voltage swells protective device of pfc circuit in frequency-conversion domestic electric appliances equipment
Block diagram, wherein frequency-conversion domestic electric appliances equipment include pfc circuit, control pfc circuit open and close PFC control module 10,
Motor M, electric machine controller 20.As shown in Figure 1, this is used for the voltage swells protective device packet of pfc circuit in frequency-conversion domestic electric appliances equipment
Include first voltage detection module 30, current detection module 40, second voltage detection module 50 and protection module 60.
Wherein, first voltage detection module 30 is used to detect the input voltage of pfc circuit.Current detection module 40 is for examining
Survey the input current of pfc circuit.Second voltage detection module 50 is used to detect the output voltage of pfc circuit.Protection module 60 is divided
Not with first voltage detection module 30, current detection module 40, second voltage detection module 50, PFC control module 10 and motor
Controller 20 is connected, and protection module 60 is used to be compared input voltage and output voltage to generate the first comparison result, and
Input current and preset maximum allowed current are compared to generate the second comparison result, and according to the first comparison result
Control is carried out and by electric machine controller 20 to motor M to pfc circuit by PFC control module 10 respectively with the second comparison result
It is controlled.
It should be noted that when frequency-conversion domestic electric appliances equipment is air conditioner, motor M is compressor.
In an embodiment of the present invention, preset maximum allowed current can be demarcated according to actual conditions.
According to an embodiment of the present invention, when input voltage is greater than or equal to output voltage and input current is greater than or equal to
When preset maximum allowed current, protection module 60 exports the first protection signal to PFC control module 10, so that PFC controls mould
Block 10 controls pfc circuit and closes, and exports the second protection signal to electric machine controller 20, so that electric machine controller 20 controls motor
M frequency reducings are run.
According to an embodiment of the present invention, when input voltage is greater than or equal to output voltage and input current is less than preset
When maximum allowed current, protection module 60 exports the first protection signal to PFC control module 10, so that PFC control module 10 is closed
Pfc circuit is closed, and motor M is controlled by electric machine controller 20 and is run according to predeterminated frequency normal operation or frequency reducing in advance.Wherein,
Predeterminated frequency can be demarcated according to actual conditions.
According to an embodiment of the present invention, when input voltage is less than output voltage and input current is more than or equal to preset
When maximum allowed current, protection module 60 exports the first protection signal to PFC control module 10, so that PFC control module 10 is controlled
Pfc circuit processed is closed, and exports the second protection signal to electric machine controller 20, so that electric machine controller 20 controls motor M frequency reducings
Operation.
According to an embodiment of the present invention, when input voltage is less than output voltage and input current is less than preset maximum and permits
Perhaps when electric current, PFC control module 10 controls pfc circuit and opens, and electric machine controller 20 controls motor M and normally transported according to predeterminated frequency
Row.
It is understood that the opening and closing of pfc circuit refer to the unlatching of device for power switching such as IGBT in pfc circuit
And closing.
Specifically, Boost type pfc circuit shown in FIG. 1 includes mainly inductance L, fast recovery diode D1, power switch device
Part IGBT and electrolytic capacitor EC.The input voltage V that protection module 60 is detected according to first voltage detection module 30in, current detecting
The input current I that module 40 detectsinAnd the output voltage V that second voltage detection module 50 detectsoutCarry out decision power switch device
The on off state of part IGBT and the operating status of motor M.
When device for power switching IGBT is in the conduction state, equivalent circuit is as shown in Fig. 2, the voltage on inductance L is
The input voltage V of the voltage that AC power exports after diode rectifier bridge rectification, i.e. first voltage detection module 30 detectionin。
Due to input voltage VinIt is always more than zero, therefore, the electric current for flowing through inductance L is gradually increasing, i.e., current detection module 40 detects
Input current IinGradually increase；When device for power switching IGBT is off state, equivalent circuit is as shown in figure 3, inductance L
On voltage be pfc circuit input voltage VinWith output voltage VoutDifference.Since Boost type pfc circuit only has boosting work(
Can, therefore, under normal operating conditions, the input voltage V of pfc circuitinLess than output voltage Vout, the voltage reversal on inductance L,
At this point, flowing through the electric current of inductance L will be gradually reduced, i.e., the input current I that current detection module 40 detectsinIt is gradually reduced.Therefore,
In a switch periods of device for power switching IGBT, input current IinWaveform as shown in figure 4, working as device for power switching
When IGBT is connected, input current IinThe rate of rise be tan α=Vin/L0；When device for power switching IGBT is turned off, input electricity
Flow IinDescending slope be tan β=(Vout-Vin)/L0, wherein L0For the inductance value of inductance L.
When AC supply voltage is normal, by controlling the conducting of device for power switching IGBT and turning off so that input voltage
VinWith input current IinSame-phase, while ensureing output voltage VoutMeet the service requirement of motor M, at this point, input voltage Vin、
Input current IinAnd output voltage VoutWaveform it is as shown in Figure 5.
And when AC supply voltage is flown up, input voltage VinIt can exceed that output voltage Vout, at this point, even if control
Device for power switching IGBT shutdowns processed, but due to the voltage (V on inductance Lin-Vout) it is more than zero, the electric current for flowing through inductance L still can
Continue to rise, as shown in Figure 6.In addition, due to the presence of electrolytic capacitor EC so that output voltage VoutIt can not rise immediately, this
When, flow through the electric current meeting rapid increase of inductance L up to overcurrent, as shown in Figure 7.It should be noted that time interval shown in Fig. 7
t1-t2For input voltage VinMore than output voltage VoutTime interval, in the time interval, if device for power switching
IGBT is in the conduction state, then input current IinThe rate of climb can be faster.
In order to solve to make the input voltage V of Boost type pfc circuit because AC supply voltage is flown upinMore than output electricity
Press VoutCaused by flow through inductance L electric current there is over-current phenomenon avoidance, in an embodiment of the present invention, protection module 60 is according to
The input voltage V that one voltage detection module 30 detects in real timein, input current I that current detection module 40 detects in real timeinAnd
The output voltage V that second voltage detection module 50 detects in real timeoutProtection control is carried out to pfc circuit and motor M.
Specifically, input voltage V of the protection module 60 to detectioninWith output voltage VoutIt is compared, to export first
Protection signal PFC_PRT_FLAG is to PFC control module 10, and PFC control module 10 is according to the first protection signal PFC_PRT_FLAG
Device for power switching IGBT is controlled.Wherein, as input voltage VinMore than or equal to output voltage VoutWhen, power switch
The protection of device IGBT is opened, and the first protection signal PFC_PRT_FLAG sets 1, and the power that PFC control module 10 exports at this time is opened
The duty ratio D for closing the drive signal of device IGBT is 0, and pfc circuit is closed；As input voltage VinLess than output voltage VoutWhen, work(
The protection of rate switching device IGBT is closed, the first protection signal PFC_PRT_FLAG is reset, at this time device for power switching IGBT
Drive signal is controlled by PFC control module 10.Meanwhile in order to prevent because of input current IinIt is excessive and lead to over-current phenomenon avoidance,
Protection module 60 is also to input current IinJudged, and exports the second protection signal MTR_PRT_FLAG to electric machine controller
20, electric machine controller 20 controls motor M according to the second protection signal MTR_PRT_FLAG.Wherein, as input current Iin
More than or equal to preset maximum allowed current ImaxWhen, by reducing the rotating speed of motor M to reduce load, so that input
Electric current IinReduce, ensures that motor M does not shut down operation；As input current IinLess than preset maximum allowed current ImaxWhen, motor M
Restore rated speed, with original load running.It should be noted that working as input current IinIt is maximum allowable more than or equal to preset
Electric current ImaxWhen, it is damaged when device for power switching IGBT is connected in order to prevent, no matter input voltage VinWhether output electricity is more than
Press Vout, it is both needed to ensure that device for power switching IGBT is off state.
In an embodiment of the present invention, protection module 60 according to control logic shown in table 1 to pfc circuit and motor M into
Row control, to ensure effectively reduce the input current I of pfc circuit when AC supply voltage is flown upin, to ensure
Pfc circuit not overcurrent, while ensureing that motor M does not shut down operation.
Table 1
Table 1 is described in detail with reference to specific example.
(1)Vout＞ VinAnd Iin＜ Imax
The state is the normal operating conditions of Boost type pfc circuit.The boost function of Boost type pfc circuit to export
Voltage VoutMore than input voltage Vin, also, the input current I under normal operating conditionsinLess than preset maximum allowed current
ImaxSuch as the maximum allowed current of device for power switching IGBT, at this point, pfc circuit is normally-open, motor M according to predeterminated frequency just
Often operation.
(2)Vout≤VinAnd Iin＜ Imax
When being flown up when AC supply voltage such as network voltage is unstable, due to the presence of electrolytic capacitor EC so that
Output voltage VoutRising lag behind input voltage Vin, therefore, there is output voltage VoutLess than input voltage VinThe case where,
The voltage on inductance L is positive at this time, also, no matter whether device for power switching IGBT turns off, and flows through the electric current of inductance L all by one
It is straight to rise, but since the electric current for flowing through inductance L cannot mutate, when Boost type pfc circuit is by normal operating conditions
When into overvoltage condition, input current IinLess than preset maximum allowed current Imax。
Assuming that device for power switching IGBT is in the conduction state, then in a switch periods of device for power switching IGBT
Electric current ascending amount meet following formula (1)：
Wherein, f is switching frequency, and D is IGBT conducting dutycycles.
Since AC supply voltage is flown up, input voltage VinAmplitude | Vin| it is much larger than input voltage VinWith output
Voltage VoutDifference amplitude | Vin-Vout|, therefore, input current IinRise quickly.In order to avoid input current IinRose
Soon, it while protecting device for power switching IGBT without damage, needs switch-off power switching device IGBT in this state, at this time power
Electric current ascending amount in a switch periods of switching device IGBT meets following formula (2)：
From above-mentioned formula (1) and formula (2) as can be seen that when device for power switching IGBT is off state, input
Electric current IinRise it is slow, at this point it is possible to by electric machine controller 20 control motor M shift to an earlier date frequency reducing operation or according to default frequency
Rate normal operation.
Specifically, when the inductance value of inductance L it is smaller (as use high frequency pfc circuit when, the switching frequency of pfc circuit
More than 20kHz) when, even if device for power switching IGBT is constantly in off state, input current IinThe rate of climb also can be very
Soon.Moreover, when electrolytic capacitor EC is bigger, output voltage VoutThe rate of climb it is slow, it is possible in a very long time
Output voltage VoutInput voltage V will be all less thanin, it needs to shift to an earlier date frequency reducing operation by the control of electric machine controller 20 motor M at this time,
Avoid over-current phenomenon avoidance.
In addition to the conditions already mentioned, in order to avoid motor M frequency reducings operation (such as air conditioner refrigeration effect variation) influences user experience, electricity
Machine controller 20 can control motor M normal operations according to predeterminated frequency.
(3)Vout≤VinAnd Iin≥Imax
If output voltage VoutIt does not rise to also more than input voltage Vin, and input current IinAlready exceed it is preset most
It is big to allow electric current Imax, for example, when network voltage flies up 100V or more, and the inductance value of inductance L is smaller, electrolytic capacitor
The capacitance of EC is again very big, which probably occurs.It needs PFC control module 10 to control pfc circuit at this time to close, and passes through
Electric machine controller 20 control motor M frequency reducings operation, on the one hand ensure device for power switching IGBT be not damaged, on the other hand due to
Therefore the conveyance capacity of the devices such as diode rectifier bridge and fast recovery diode D1 may be used also much larger than device for power switching IGBT
Motor M is set to rerun a period of time in a manner of being run by frequency reducing.If input current IinIt continues to rise, then needs to disconnect confession
Power supply is to protect frequency-conversion domestic electric appliances equipment.
(4)Vout＞ VinAnd Iin≥Imax
If output voltage VoutIt has risen to and is more than input voltage Vin, but input current IinDo not restore also to normal
Value, then in order to protect device for power switching IGBT, need to ensure that device for power switching IGBT is constantly in off state.At this point, by
In output voltage VoutMore than input voltage Vin, the voltage reversal on inductance L, therefore, the electric current for flowing through inductance L is gradually reduced,
Electric current reduction amount in a switch periods of device for power switching IGBT meets following formula (3)：
Meanwhile in order to make input current IinFast quick-recovery need to control motor M frequency reducings to normal value by electric machine controller 20
Operation.
The input voltage V of pfc circuit after protectionin, input current IinWith output voltage VoutWaveform such as Fig. 8 institutes
Show.It is compared it is found that when AC supply voltage is flown up with Fig. 7, can effectively reduce input current IinWith power switch device
The electric current of part IGBT, and ensure not shutting down operation.
Further, in order to protect the safety of the device in addition to device for power switching IGBT, device failure is prevented, may be used also
To add the first current threshold Imax2, which is according to the maximum allowable of diode rectifier bridge and fast recovery diode D1
Electric current is set.Since the conveyance capacity of diode rectifier bridge and fast recovery diode D1 are much larger than device for power switching
IGBT, therefore, the first current threshold Imax2Maximum allowed current more than device for power switching IGBT, that is, preset maximum allowable
Electric current Imax。
The control logic of protection module 60 is as shown in table 2.
Table 2
Work as Vout＞ VinAnd Iin＜ ImaxWhen, it is the normal operating conditions of Boost type pfc circuit, is controlled at this time by motor
Device 20 controls motor M according to predeterminated frequency normal operation.
Work as Vout≤VinAnd Iin＜ ImaxWhen, pfc circuit is controlled by pfc circuit protection module 10 and is closed, and passes through motor
Controller 20 controls motor M and is run according to predeterminated frequency normal operation or frequency reducing in advance.Wherein, when the inductance value of inductance L compares
When small and electrolytic capacitor EC capacitance is bigger, motor M is controlled by electric machine controller 20 and shifts to an earlier date frequency reducing operation, otherwise, is passed through
Electric machine controller 20 controls motor M according to predeterminated frequency normal operation.
Work as Vout＞ VinAnd Imax≤Iin＜ Imax2When, switch-off power switching device IGBT first is to protect it from being damaged.
In addition, due to output voltage VoutMore than input voltage VinSo that the voltage reversal on inductance L, input current IinIt will be gradually reduced
It, at this time can be by reducing rotary speed instruction ω to normal value*Motor M frequency reducings are made to run, so that input current IinIt can be quickly extensive
Again to normal value.
Work as Vout≤VinAnd Imax≤Iin＜ Imax2When, pass through preset intermediate current threshold value Imax21To further determine that electricity
Control mode when machine frequency reducing is run.Work as Vout≤VinAnd Imax≤Iin＜ Imax21When, switch-off power switching device IGBT is to protect
Its is without damage, and by reducing rotary speed instruction ω*Motor M frequency reducings are made to run；Work as Vout≤VinAnd Imax21≤Iin＜ Imax2When,
Switch-off power switching device IGBT first is to protect it from being damaged, in addition, though input current IinAlso it is not up to the first electric current
Threshold value Imax2, but already close to the first current threshold Imax2, also, the response speed of current regulation loops is far faster than rotational speed regulation
The response speed of loop therefore can be by changing current-order Iq *The electromagnetic torque that motor M is generated is set quickly to reduce, to reach
To the purpose of quick frequency reducing.
Work as Iin≥Imax2When, no matter input voltage VinWhether output voltage V is more thanout, input current IinAlready exceed change
The ability to bear of device in frequency household appliance, it is therefore necessary to which power-off is shut down.
In conclusion the voltage swells protection dress according to the ... of the embodiment of the present invention for pfc circuit in frequency-conversion domestic electric appliances equipment
It sets, the input voltage of pfc circuit is detected by first voltage detection module, and pfc circuit is detected by current detection module
Input current, and the output voltage of pfc circuit is detected by second voltage detection module, protection module is to input voltage and defeated
Go out voltage to be compared to generate the first comparison result, and input current and preset maximum allowed current are compared with life
At the second comparison result, and pass through PFC control module and motor control respectively with the second comparison result according to the first comparison result
Device processed controls pfc circuit and motor, to electric current be effectively prevent excessive in voltage swells and damage power and open
Device IGBT and other devices are closed, also, are ensureing that device is not impaired, ensures pfc circuit normal work, avoids
Because overprotection makes motor stopping, the reliability and user experience of frequency-conversion domestic electric appliances equipment are improved.
Fig. 9 is according to the embodiment of the present invention for the voltage swells guard method of pfc circuit in frequency-conversion domestic electric appliances equipment
Flow chart, wherein frequency-conversion domestic electric appliances equipment include pfc circuit, control pfc circuit open and close PFC control module, motor,
Electric machine controller.As shown in figure 9, the voltage swells guard method for being used for pfc circuit in frequency-conversion domestic electric appliances equipment includes following step
Suddenly：
S1, detects the input voltage of pfc circuit, and detects the input current of pfc circuit.
S2 detects the output voltage of pfc circuit.
S3 is compared input voltage and output voltage to generate the first comparison result, and to input current and presets
Maximum allowed current be compared to generate the second comparison result, and according to the first comparison result with the second comparison result point
Control is not carried out to pfc circuit by PFC control module and motor is controlled by electric machine controller.
It should be noted that when frequency-conversion domestic electric appliances equipment is air conditioner, motor is compressor.
According to one embodiment of present invention, it is more than or waits when input voltage is greater than or equal to output voltage and input current
When preset maximum allowed current, the first protection signal of output to PFC control module, so that PFC control module control PFC electricity
Road is closed, and exports the second protection signal to electric machine controller, so that electric machine controller control motor frequency reducing operation.
According to one embodiment of present invention, when input voltage is greater than or equal to output voltage and input current is less than default
Maximum allowed current when, the first protection signal of output is to PFC control module so that PFC control module closes pfc circuit, and
And electric machine controller control motor is run according to predeterminated frequency normal operation or frequency reducing in advance.
According to one embodiment of present invention, when input voltage is less than output voltage and input current is more than or equal to default
Maximum allowed current when, the first protection signal of output is to PFC control module, so that PFC control module control pfc circuit closes
It closes, and exports the second protection signal to electric machine controller, so that electric machine controller control motor frequency reducing operation.
According to one embodiment of present invention, when input voltage is less than output voltage and input current is less than preset maximum
When allowing electric current, PFC control module controls pfc circuit and opens, and electric machine controller controls motor according to predeterminated frequency normal operation.
It is understood that the opening and closing of pfc circuit refer to the unlatching of device for power switching such as IGBT in pfc circuit
And closing.
A specific example according to the present invention, as shown in Figure 1, Boost type pfc circuit includes mainly inductance L, fast recovery
Diode D1, device for power switching IGBT and electrolytic capacitor EC.In the circuit, electric resistance partial pressure method can be led to obtain respectively
The input voltage V of pfc circuitinWith output voltage Vout, the input current I of pfc circuit is obtained by resistance sampling methodin, and
According to the input voltage V of the pfc circuit of acquisitionin, input current IinWith output voltage VoutCarry out decision device for power switching IGBT
On off state and motor operating status.
When device for power switching IGBT is in the conduction state, equivalent circuit is as shown in Fig. 2, the voltage on inductance L is
The voltage that AC power exports after diode rectifier bridge rectification, i.e. input voltage Vin.Due to input voltage VinIt is always more than
Zero, therefore, the electric current for flowing through inductance L is gradually increasing, i.e. input current IinGradually increase；It is closed when device for power switching IGBT is in
When disconnected state, equivalent circuit is as shown in figure 3, the voltage on inductance L is the input voltage V of pfc circuitinWith output voltage Vout
Difference.Since Boost type pfc circuit only has boost function, under normal operating conditions, the input voltage V of pfc circuitin
Less than output voltage Vout, the voltage reversal on inductance L, at this point, flowing through the electric current of inductance L will be gradually reduced, i.e. input current Iin
It is gradually reduced.Therefore, in a switch periods of device for power switching IGBT, input current IinWaveform as shown in figure 4, working as
When device for power switching IGBT conductings, input current IinThe rate of rise be tan α=Vin/L0；When device for power switching IGBT is closed
When disconnected, input current IinDescending slope be tan β=(Vout-Vin)/L0, wherein L0For the inductance value of inductance L.
When AC supply voltage is normal, by controlling the conducting of device for power switching IGBT and turning off so that input voltage
VinWith input current IinSame-phase, while ensureing output voltage VoutMeet the service requirement of motor, at this point, input voltage Vin、
Input current IinAnd output voltage VoutWaveform it is as shown in Figure 5.
And when AC supply voltage is flown up, input voltage VinIt can exceed that output voltage Vout, at this point, even if control
Device for power switching IGBT shutdowns processed, but due to the voltage (V on inductance Lin-Vout) it is more than zero, the electric current for flowing through inductance L still can
Continue to rise, as shown in Figure 6.In addition, due to the presence of electrolytic capacitor EC so that output voltage VoutIt can not rise immediately, this
When, flow through the electric current meeting rapid increase of inductance L up to overcurrent, as shown in Figure 7.It should be noted that time interval shown in Fig. 7
t1-t2For input voltage VinMore than output voltage VoutTime interval, in the time interval, if device for power switching
IGBT is in the conduction state, then input current IinThe rate of climb can be faster.
In order to solve to make the input voltage V of Boost type pfc circuit because AC supply voltage is flown upinMore than output electricity
Press VoutCaused by flow through inductance L electric current there is over-current phenomenon avoidance, it is in an embodiment of the present invention, defeated according to what is detected in real time
Enter voltage Vin, input current IinAnd output voltage VoutProtection control is carried out to pfc circuit and motor.
Specifically, to the input voltage V of detectioninWith output voltage VoutIt is compared, to export the first protection signal
PFC_PRT_FLAG is to PFC control module, and PFC control module is according to the first protection signal PFC_PRT_FLAG to power switch device
Part IGBT is controlled.Wherein, as input voltage VinMore than or equal to output voltage VoutWhen, the guarantor of device for power switching IGBT
Shield is opened, and the first protection signal PFC_PRT_FLAG sets 1, the drive of the device for power switching IGBT of PFC control module output at this time
The duty ratio D of dynamic signal is 0, and pfc circuit is closed；As input voltage VinLess than output voltage VoutWhen, device for power switching IGBT
Protection close, the first protection signal PFC_PRT_FLAG is reset, and the drive signal of device for power switching IGBT is controlled by PFC at this time
Molding block controls.Meanwhile in order to prevent because of input current IinIt is excessive and lead to over-current phenomenon avoidance, also to input current IinInto
Row judges, and exports the second protection signal MTR_PRT_FLAG to electric machine controller, and electric machine controller is according to the second protection signal
MTR_PRT_FLAG controls motor.Wherein, as input current IinMore than or equal to preset maximum allowed current Imax
When, by reducing the rotating speed of motor to reduce load, so that input current IinReduce, ensures that motor does not shut down operation；When
Input current IinLess than preset maximum allowed current ImaxWhen, motor restores rated speed, with original load running.It needs
It is bright, as input current IinMore than or equal to preset maximum allowed current ImaxWhen, device for power switching IGBT in order to prevent
It is damaged when conducting, no matter input voltage VinWhether output voltage V is more thanout, it is both needed to ensure that device for power switching IGBT is in
Off state.
In an embodiment of the present invention, pfc circuit and motor are controlled according to control logic shown in above-mentioned table 1,
To ensure effectively reduce the input current I of pfc circuit when AC supply voltage is flown upinWith flow through power switch device
The electric current of part IGBT to ensure pfc circuit not overcurrent, and ensures that motor does not shut down operation.With reference to specific example to table 1
It is described in detail.
(1)Vout＞ VinAnd Iin＜ Imax
The state is the normal operating conditions of Boost type pfc circuit.The boost function of Boost type pfc circuit to export
Voltage VoutMore than input voltage Vin, also, the input current I under normal operating conditionsinLess than preset maximum allowed current
ImaxSuch as the maximum allowed current of device for power switching IGBT, at this point, pfc circuit is normally-open, motor is normal according to predeterminated frequency
Operation.
(2)Vout≤VinAnd Iin＜ Imax
When being flown up when AC supply voltage such as network voltage is unstable, due to the presence of electrolytic capacitor EC so that
Output voltage VoutRising lag behind input voltage Vin, therefore, there is output voltage VoutLess than input voltage VinThe case where,
The voltage on inductance L is positive at this time, also, no matter whether device for power switching IGBT turns off, and flows through the electric current of inductance L all by one
It is straight to rise, but since the electric current for flowing through inductance L cannot mutate, when Boost type pfc circuit is by normal operating conditions
When into overvoltage condition, input current IinLess than preset maximum allowed current Imax。
Assuming that device for power switching IGBT is in the conduction state, then in a switch periods of device for power switching IGBT
Electric current ascending amount meet above-mentioned formula (1).Since AC supply voltage is flown up, input voltage VinAmplitude | Vin| it is remote
More than input voltage VinWith output voltage VoutDifference amplitude | Vin-Vout|, therefore, input current IinRise quickly.In order to keep away
Exempt from input current IinRise too fast, while protecting device for power switching IGBT without damage, need switch-off power to open in this state
Device IGBT is closed, the electric current ascending amount in device for power switching IGBT a switch periods meets above-mentioned formula (2) at this time.
From above-mentioned formula (1) and formula (2) as can be seen that when device for power switching IGBT is off state, input
Electric current IinRise it is slow, at this point it is possible to by electric machine controller control motor shift to an earlier date frequency reducing operation or according to predeterminated frequency
Normal operation.
Specifically, when the inductance value of inductance L it is smaller (as use high frequency pfc circuit when, the switching frequency of pfc circuit
More than 20kHz) when, even if device for power switching IGBT is constantly in off state, input current IinThe rate of climb also can be very
Soon.Moreover, when electrolytic capacitor EC is bigger, output voltage VoutThe rate of climb it is slow, it is possible in a very long time
Output voltage VoutInput voltage V will be all less thanin, need to shift to an earlier date frequency reducing operation by electric machine controller control motor at this time, avoid
Over-current phenomenon avoidance occurs.
In addition to the conditions already mentioned, in order to avoid motor frequency reducing operation (such as air conditioner refrigeration effect variation) influences user experience, electricity
Machine controller can control motor normal operation according to predeterminated frequency.
(3)Vout≤VinAnd Iin≥Imax
If output voltage VoutIt does not rise to also more than input voltage Vin, and input current IinAlready exceed it is preset most
It is big to allow electric current Imax, for example, when network voltage flies up 100V or more, and the inductance value of inductance L is smaller, electrolytic capacitor
The capacitance of EC is again very big, which probably occurs.It needs PFC control module control pfc circuit to close at this time, and passes through electricity
Machine controller controls motor frequency reducing operation, on the one hand ensures that device for power switching IGBT is not damaged, on the other hand due to two poles
The conveyance capacity of the devices such as pipe rectifier bridge and fast recovery diode D1 is much larger than device for power switching IGBT, and hence it is also possible to logical
Crossing the mode of frequency reducing operation makes motor rerun a period of time.If input current IinIt continues to rise, then needs to disconnect power supply electricity
Source is to protect frequency-conversion domestic electric appliances equipment.
(4)Vout＞ VinAnd Iin≥Imax
If output voltage VoutIt has risen to and is more than input voltage Vin, but input current IinDo not restore also to normal
Value, then in order to protect device for power switching IGBT, need to ensure that device for power switching IGBT is constantly in off state.At this point, by
In output voltage VoutMore than input voltage Vin, the voltage reversal on inductance L, therefore, the electric current for flowing through inductance L is gradually reduced,
Electric current reduction amount in a switch periods of device for power switching IGBT meets above-mentioned formula (3).Meanwhile in order to keep input electric
Flow IinFast quick-recovery need to control motor frequency reducing operation to normal value by electric machine controller.
The input voltage V of pfc circuit after protectionin, input current IinWith output voltage VoutWaveform such as Fig. 8 institutes
Show.It is compared it is found that when AC supply voltage is flown up with Fig. 7, can effectively reduce input current IinWith power switch device
The electric current of part IGBT, and ensure not shutting down operation.
Further, in order to protect the safety of the device in addition to device for power switching IGBT, device failure is prevented, may be used also
To add the first current threshold Imax2, which is according to the maximum allowable of diode rectifier bridge and fast recovery diode D1
Electric current is set.Since the conveyance capacity of diode rectifier bridge and fast recovery diode D1 are much larger than device for power switching
IGBT, therefore, the first current threshold Imax2Maximum allowed current more than device for power switching IGBT, that is, preset maximum allowable
Electric current Imax.Its control logic is as shown in Table 2 above.
Work as Vout＞ VinAnd Iin＜ ImaxWhen, it is the normal operating conditions of Boost type pfc circuit, is controlled at this time by motor
Device controls motor according to predeterminated frequency normal operation.
Work as Vout≤VinAnd Iin＜ ImaxWhen, pfc circuit is controlled by pfc circuit protection module and is closed, and passes through motor control
Device control motor processed is run according to predeterminated frequency normal operation or frequency reducing in advance.Wherein, when the inductance value of inductance L is smaller and electric
When the capacitance of solution capacitance EC is bigger, motor is controlled by electric machine controller and shifts to an earlier date frequency reducing operation, otherwise, passes through electric machine controller
Motor is controlled according to predeterminated frequency normal operation.
Work as Vout＞ VinAnd Imax≤Iin＜ Imax2When, switch-off power switching device IGBT first is to protect it from being damaged.
In addition, due to output voltage VoutMore than input voltage VinSo that the voltage reversal on inductance L, input current IinIt will be gradually reduced
It, at this time can be by reducing rotary speed instruction ω to normal value*Motor frequency reducing is set to run, so that input current IinIt being capable of fast quick-recovery
To normal value.
Work as Vout≤VinAnd Imax≤Iin＜ Imax2When, pass through preset intermediate current threshold value Imax21To further determine that electricity
Control mode when machine frequency reducing is run.Work as Vout≤VinAnd Imax≤Iin＜ Imax21When, switch-off power switching device IGBT is to protect
Its is without damage, and by reducing rotary speed instruction ω*Motor frequency reducing is set to run；Work as Vout≤VinAnd Imax21≤Iin＜ Imax2When, it is first
Device for power switching IGBT is first turned off to protect it from being damaged, in addition, though input current IinAlso it is not up to the first current threshold
Value Imax2, but already close to the first current threshold Imax2, also, the response speed of current regulation loops is far faster than rotational speed regulation ring
The response speed on road therefore can be by changing current-order Iq *The electromagnetic torque that motor generates is set quickly to reduce, to reach fast
The purpose of prompt drop frequency.
Work as Iin≥Imax2When, no matter input voltage VinWhether output voltage V is more thanout, input current IinAlready exceed change
The ability to bear of device in frequency household appliance, it is therefore necessary to which power-off is shut down.
Voltage swells guard method according to the ... of the embodiment of the present invention for pfc circuit in frequency-conversion domestic electric appliances equipment is examined first
The input voltage of pfc circuit is surveyed, and detects the input current of pfc circuit and detects the output voltage of pfc circuit, then to defeated
Enter voltage and output voltage be compared to generate the first comparison result, and to input current and preset maximum allowed current into
Row is relatively to generate the second comparison result, and controls mould by PFC respectively with the second comparison result according to the first comparison result
Block carries out control to pfc circuit and is controlled motor by electric machine controller, to can effectively prevent in voltage swells
Only electric current is excessive and damage device for power switching IGBT and other devices, also, is ensureing that device is not impaired, protects
Pfc circuit normal work is demonstrate,proved, avoids making motor stopping because of overprotection, improves the reliability and user's body of frequency-conversion domestic electric appliances equipment
It tests.
In the description of the present invention, it is to be understood that, term "center", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on ... shown in the drawings or
Position relationship is merely for convenience of description of the present invention and simplification of the description, and does not indicate or imply the indicated 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 used for description purposes only, it is not understood to indicate or imply relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；Can be that machinery connects
It connects, can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary in two elements
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are in direct 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 be directly above or diagonally above the second feature, 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 directly under or diagonally below the second feature, 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 spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (8)
1. a kind of voltage swells protective device for PFC pfc circuit in frequency-conversion domestic electric appliances equipment, which is characterized in that
The frequency-conversion domestic electric appliances equipment include the pfc circuit, the control pfc circuit open and close PFC control module, motor,
Electric machine controller, the voltage swells protective device include：
First voltage detection module, the first voltage detection module are used to detect the input voltage of the pfc circuit；
Current detection module, the current detection module are used to detect the input current of the pfc circuit；
Second voltage detection module, the second voltage detection module are used to detect the output voltage of the pfc circuit；And
Protection module, the protection module respectively with the first voltage detection module, the current detection module, described second
Voltage detection module, the PFC control module are connected with the electric machine controller, and the protection module is used for input electricity
Pressure and the output voltage are compared to generate the first comparison result, and to the input current and preset maximum allowable electricity
Stream is compared to generate the second comparison result, and is led to respectively according to first comparison result and second comparison result
The PFC control module is crossed to carry out control to the pfc circuit and control the motor by the electric machine controller,
Wherein,
When the input voltage is more than or equal to the output voltage and the input current is less than described preset maximum allowable
When electric current, the protection module exports the first protection signal to the PFC control module, so that the PFC control module is closed
The pfc circuit, and the motor is controlled by the electric machine controller and is transported according to predeterminated frequency normal operation or frequency reducing in advance
Row, wherein further determine that it is the control motor according to the inductance value of inductance in the pfc circuit and the capacitance of electrolytic capacitor
Frequency reducing in advance is run also according to predeterminated frequency normal operation.
2. the voltage swells protection dress for PFC pfc circuit in frequency-conversion domestic electric appliances equipment as described in claim 1
It sets, which is characterized in that when the input voltage is more than or equal to the output voltage and the input current is more than or equal to institute
When stating preset maximum allowed current, the protection module exports the first protection signal to the PFC control module, so that described
PFC control module controls the pfc circuit and closes, and exports the second protection signal to the electric machine controller, so that the electricity
Machine controller controls the motor frequency reducing operation.
3. the voltage swells protection dress for PFC pfc circuit in frequency-conversion domestic electric appliances equipment as described in claim 1
Set, which is characterized in that when the input voltage be less than the output voltage and the input current be greater than or equal to it is described default
Maximum allowed current when, the protection module exports the first protection signal to the PFC control module, so that the PFC is controlled
Molding block controls the pfc circuit and closes, and exports the second protection signal to the electric machine controller, so that the motor controls
Device controls the motor frequency reducing operation.
4. the voltage swells protection dress for PFC pfc circuit in frequency-conversion domestic electric appliances equipment as described in claim 1
It sets, which is characterized in that when the input voltage is less than the output voltage and the input current is less than the preset maximum
When allowing electric current, the PFC control module controls the pfc circuit and opens, the electric machine controller control the motor according to
Predeterminated frequency normal operation.
5. a kind of voltage swells guard method for PFC pfc circuit in frequency-conversion domestic electric appliances equipment, which is characterized in that
The frequency-conversion domestic electric appliances equipment include the pfc circuit, the control pfc circuit open and close PFC control module, motor,
Electric machine controller, the voltage swells guard method include the following steps：
The input voltage of the pfc circuit is detected, and detects the input current of the pfc circuit；
Detect the output voltage of the pfc circuit；And
The input voltage and the output voltage are compared to generate the first comparison result, and to the input current and
Preset maximum allowed current is compared to generate the second comparison result, and according to first comparison result and described
Two comparison results carry out control to the pfc circuit by the PFC control module respectively and by the electric machine controllers pair
The motor is controlled, wherein is less than when the input voltage is greater than or equal to the output voltage and the input current
When the preset maximum allowed current, the first protection signal of output to the PFC control module, so that the PFC controls mould
Block closes the pfc circuit, and the electric machine controller controls the motor according to predeterminated frequency normal operation or drops in advance
Frequency is run, wherein further determines that it is described in control according to the inductance value of inductance in the pfc circuit and the capacitance of electrolytic capacitor
Motor shifts to an earlier date frequency reducing operation also according to predeterminated frequency normal operation.
6. the voltage swells protection side for PFC pfc circuit in frequency-conversion domestic electric appliances equipment as claimed in claim 5
Method, which is characterized in that when the input voltage is more than or equal to the output voltage and the input current is more than or equal to institute
When stating preset maximum allowed current, the first protection signal of output is to the PFC control module, so that the PFC control module
It controls the pfc circuit to close, and exports the second protection signal to the electric machine controller, so that the electric machine controller controls
The motor frequency reducing operation.
7. the voltage swells protection side for PFC pfc circuit in frequency-conversion domestic electric appliances equipment as claimed in claim 5
Method, which is characterized in that when the input voltage be less than the output voltage and the input current be greater than or equal to it is described default
Maximum allowed current when, the first protection signal of output is to the PFC control module, so that the PFC control module controls institute
Pfc circuit closing is stated, and exports the second protection signal to the electric machine controller, so that the electric machine controller controls the electricity
Machine frequency reducing is run.
8. the voltage swells protection side for PFC pfc circuit in frequency-conversion domestic electric appliances equipment as claimed in claim 5
Method, which is characterized in that when the input voltage is less than the output voltage and the input current is less than the preset maximum
When allowing electric current, the PFC control module controls the pfc circuit and opens, the electric machine controller control the motor according to
Predeterminated frequency normal operation.
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| CN201510288920.2A CN104967301B (en) | 2015-05-29 | 2015-05-29 | Voltage swells protective device, the method for pfc circuit in frequency-conversion domestic electric appliances equipment |
| PCT/CN2015/082870 WO2016192160A1 (en) | 2015-05-29 | 2015-06-30 | Device and method for protecting voltage surge of pec circuit in variable-frequency household electric apparatus |
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| CN201510288920.2A CN104967301B (en) | 2015-05-29 | 2015-05-29 | Voltage swells protective device, the method for pfc circuit in frequency-conversion domestic electric appliances equipment |
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| CN105656302B (en) * | 2016-04-07 | 2019-05-03 | 湖州积微电子科技有限公司 | A kind of frequency converter pfc circuit |
| CN106288192B (en) * | 2016-08-17 | 2019-05-31 | 青岛海尔空调器有限总公司 | Air-conditioning pfc circuit control method and air-conditioning |
| CN107086770B (en) * | 2017-06-30 | 2023-03-31 | 广东美的制冷设备有限公司 | PFC circuit and variable frequency air conditioner |
| CN108199576B (en) * | 2018-01-29 | 2023-11-28 | 广东美的制冷设备有限公司 | PFC circuit, motor control system and variable frequency air conditioner |
| CN111262419B (en) * | 2020-03-14 | 2023-05-12 | 广州市龙玥电气科技有限公司 | Overcurrent protection device for frequency converter |
| CN112600160B (en) * | 2020-12-04 | 2023-01-17 | 海信空调有限公司 | PFC circuit protection device and air conditioner |
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| CN104218530B (en) * | 2013-05-31 | 2018-06-19 | 杭州先途电子有限公司 | A kind of hardware protection circuit of active PFC |
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2015
- 2015-05-29 CN CN201510288920.2A patent/CN104967301B/en active Active
- 2015-06-30 WO PCT/CN2015/082870 patent/WO2016192160A1/en active Application Filing
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| CN1437308A (en) * | 2002-02-08 | 2003-08-20 | 张法曾 | Integral switching power source with zero-ripple switching modulation rectification and off-line conversion |
| CN102124639A (en) * | 2008-12-25 | 2011-07-13 | 株式会社日立制作所 | Apparatus for protecting power supply circuit of three-phase inverter |
| CN101964595A (en) * | 2009-07-22 | 2011-02-02 | 索尼公司 | Supply unit and method |
| CN102570846A (en) * | 2010-12-24 | 2012-07-11 | 张旺华 | Power factor correction (PFC) power socket |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN104967301A (en) | 2015-10-07 |
| WO2016192160A1 (en) | 2016-12-08 |
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