CN109980915A - Circuit of power factor correction and air conditioner - Google Patents
Circuit of power factor correction and air conditioner Download PDFInfo
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- CN109980915A CN109980915A CN201910415198.2A CN201910415198A CN109980915A CN 109980915 A CN109980915 A CN 109980915A CN 201910415198 A CN201910415198 A CN 201910415198A CN 109980915 A CN109980915 A CN 109980915A
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- 238000012937 correction Methods 0.000 title claims abstract description 108
- 230000001681 protective effect Effects 0.000 claims abstract description 49
- 238000001514 detection method Methods 0.000 claims description 77
- 238000005070 sampling Methods 0.000 claims description 44
- 239000003990 capacitor Substances 0.000 claims description 27
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- 230000002159 abnormal effect Effects 0.000 abstract description 10
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- 238000012545 processing Methods 0.000 description 5
- 230000005856 abnormality Effects 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000005669 field effect Effects 0.000 description 3
- 230000001960 triggered effect Effects 0.000 description 3
- 230000005355 Hall effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000005347 demagnetization Effects 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
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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
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- Engineering & Computer Science (AREA)
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Abstract
The present invention provides a kind of circuit of power factor correction and air conditioners, wherein circuit of power factor correction includes: power factor correction module, and the ac input end of power factor correction module is connected to AC power source, for AC power source to be rectified into direct current output；Switch drive module is connected to the driving input terminal of power factor correction module, is used for power factor correction module output switching signal；Control module is connected to switch drive module, for controlling the driving output opened or closed to switch drive module；Hall current sensor is set to the exchange input side of power factor correction module；Protective module is driven, is connect with Hall current sensor and control module, for according to the relationship between sampled signal and corresponding first secure threshold, it is determined whether to control module output protection signal.According to the technical solution of the present invention, it can more directly detect whether rectifier exception occurs, and when determining that appearance is abnormal, can determine corresponding exceptional part under different operating conditions.
Description
Technical field
The present invention relates to air-conditioning technical fields, in particular to a kind of circuit of power factor correction and a kind of air conditioner.
Background technique
In the related technology, circuit of power factor correction (i.e. pfc circuit) using high-power MOS, (partly lead by metal-oxide-
Body) switching technique as main power device substitute IGBT (insulated gate bipolar transistor) device, utilize the low conduction impedance of MOS
The characteristic that characteristic replaces IGBT conduction voltage drop constant realizes the lower power consumption under middle low power, to realize the function for reducing air conditioner
Consumption.
Power factor correction module is constituted using four switching tubes, and using two half-bridge driven chip drivings, wherein one
A driving chip has defencive function, carries out over-current detection in conjunction with sampling resistor, if detecting high current, triggers closing to four
The driving of a switch exports, and to carry out overcurrent protection, but the program has the following deficiencies:
As shown in Figure 1, existing protection scheme can only realize that upper and lower Q1 and Q3 abnormal or upper and lower Q2 and Q4 occur and go out
Detection when now abnormal, and two switching tubes are protected since switch drive module itself built-in can interlock up and down in practical applications
Protection circuit, upper and lower bridge arm is straight-through to be difficult to occur, so the probability that the corresponding failure of the protection scheme occurs is very low, practicability compares
Difference.
Summary of the invention
The present invention is directed to solve at least one of the technical problems existing in the prior art or related technologies.
For this purpose, it is an object of the present invention to provide a kind of circuit of power factor correction.
It is another object of the present invention to provide a kind of air conditioners.
To achieve the goals above, according to the embodiment of the first aspect of the invention, a kind of PFC is provided
Circuit, comprising: power factor correction module receives power supply signal, and the power factor correction module includes switching tube, described to open
It closes pipe and is configured as controlling the power supply signal to load supplying；Switch drive module is connected to the PFC mould
The driving input terminal of block is used for the power factor correction module output switching signal；Control module is connected to the switch
Drive module, for controlling, the switch drive module opens the output switching signal or closing exports the switching signal；
Current sensor is specifically as follows Hall current sensor, is set to the input side of the power factor correction module, with acquisition
Input current, and the input current is determined as sampled signal；Drive protective module, with the Hall current sensor and
Control module connection, the sampled signal is if more than the first secure threshold, then to the control module output protection signal,
The protection signal is for triggering the output that the control module closes the switch drive module.
In the technical scheme, Hall current sensor, Hall are set in the ac input end of power factor correction module
Position of the current sensor based on setting acquires the input current of power factor correction module, or output electric current, and electric current is turned
It is changed in sampled signal output driving protective module, to detect whether occurring over-current phenomenon avoidance by driving protective module, to detect
In the case where there is over-current phenomenon avoidance, control stops to power factor correction module output switching signal, on the one hand, due to Hall
Current sensor is not in electrical contact with circuit-under-test, can not consume the power of tested power supply, therefore does not influence frequency conversion equipment
Efficient low power consumption control, on the other hand, since Hall current sensor directly acquires the input terminal of power factor correction module
Electric current makes power factor correction module corresponding different current flow paths when executing different feature operations that can pass through Hall
Current sensor carries out circuit abnormality detection, therefore can more directly detect whether rectifier exception, Yi Ji occurs
When determining that appearance is abnormal, corresponding exceptional part can determine under different operating conditions, middle use has compared with the existing technology
The driving chip combination sampling resistor of defencive function carries out the scheme of over-current detection, and limitation is smaller, and more has and be directed to
Property and practicability.
First secure threshold is the secure threshold of input terminal voltage.
Wherein, Hall current sensor is that high current is transformed to secondary small sampled signal using Hall effect
Small sampled signal is enlarged into normal voltage, that is to say, that Hall current sensor pair by sensor, and associative operation amplifier
Outer output sampled signal, and be compared with the secure threshold built in driving protective module, circuit is determined according to the result of the comparison
In whether there is short circuit overcurrent phenomenon, since Hall current sensor can both measure exchange, direct current can also be measured, therefore both
The exchange input side in power factor correction module can be set, the direct current output in power factor correction module also can be set
Side.
In the above-mentioned technical solutions, optionally, further includes: the power factor correction module is arranged in sampling resistor
Cathode output end, and it is connected to the driving protective module, the driving protective module is on detecting the sampling resistor
Pressure drop is more than the second secure threshold, and Xiang Suoshu control module exports the protection signal.
In the technical scheme, by the exchange side of power factor correction module connect a Hall current sensor,
For being responsible for the electric current of detection exchange side, the sampled signal for then exporting the sensor is as the input letter of driving protective module
Number, it is incorporated in the concatenated sampling resistor of cathode output end of power factor correction module, the voltage of sampling resistor detection is also defeated
Enter to drive protective module, when any one of input voltage of this two-way is more than current detecting and the predeterminated voltage for driving protective module
When, all trigger current is detected and is driven protection and the switch-off power factor correcting module of protective module, thus in input and output
The detection function to over-current phenomenon avoidance may be implemented in side.
Second secure threshold is the voltage security threshold value of the cathode output end of power factor correction module.
In any of the above-described technical solution, optionally, further includes: reactor is set to the PFC mould
Between block and AC power source；Zero crossing detection module is arranged between the zero line and zero line side of the AC power source, and is connected to
The control module, the zero crossing detection module are used to acquire the zero passage detection letter between the zero line and the zero line side
Number；The control module is also used to: determining the AC power source according to the zero passage detection signal that the zero crossing detection module exports
Phase state, with according to the phase state to the rectification driving voltage output switch control signal, to control to described
Reactor charges, and the AC power source is for exporting the power supply signal.
In the technical scheme by the way that reactor to be arranged in the ac input end and alternating current of power factor correction module
Between source, AC power source carry out exchange output when, reactor the electric energy supplied from AC power source can be converted to magnetic energy with
As energy stores, and the boosting of pfc circuit and the improvement of power factor can be realized by discharging the energy.
Specifically, by the way that zero crossing detection module is arranged between firewire and zero curve, to judge to exchange by zero crossing detection module
The real-time phase of power supply, to be executed according to switching device different in different phase state driving power factor correcting modules
Switch operation, to realize rectification function or PFC (PFC) function respectively, to realize load end based on rectification function
Direct current supply, or controlled by PFC, make to exchange side voltage and ac-side current and reach consistent in phase.
In addition, there are many reason of generating over-current phenomenon avoidance, for example circuit is interfered and causes control module crash reset, or
Short circuit exception etc. occurs for reactor.
In any of the above-described technical solution, optionally, Hall current sensor setting the AC power source with
Between the reactor；The driving protective module is also used to: if detecting, the sampled signal is greater than the first secure threshold,
The protection signal is exported to the control module, to close the output of the switch drive module.
Wherein, Hall current sensor can be placed in any position of the concatenated firewire of reactor or zero curve.
In any of the above-described technical solution, optionally, the power factor correction module is opened by first switch tube, second
Guan Guan, third switching tube construct to be formed with the 4th switching tube, and first switch tube and second switch are set to PFC
The top of module, third switching tube and the 4th switching tube are set to the lower part of power factor correction module, first switch tube and the
Three switching tubes are set to the left part of power factor correction module, and second switch and the 4th switching tube are set to PFC
The right part of module, the first switch tube, the second switch, the third switching tube and the 4th switching tube are reversely simultaneously
It is associated with freewheeling diode, by drain electrode and the drain series of the second switch of the first switch tube, and tie point is true
It is set to the cathode output end of the power factor correction module, by the source electrode of the source electrode of the third switching tube and the 4th switching tube
Series connection, is determined as the cathode output end for tie point, to be grounded after connecting with the sampling resistor, by the first switch tube
Source electrode and the third switching tube drain series, and tie point is connected to the zero line, by the second switch
Source electrode and the 4th switching tube drain series, and tie point is connected to the zero line side.
Specifically, first switch tube, second switch, third switching tube and the 4th switching tube all can be MOSFET
(Metal-Oxide-Semiconductor Field-Effect TransIstor, metal oxide semiconductor field effect transistor
Pipe, i.e. metal-oxide-semiconductor), such as super node MOSFET or SiC-MOSFET.
The working method of metal-oxide-semiconductor, controls on-off between source electrode and drain electrode by grid and realizes and switch, and when conducting needs grid
Power supply is greater than source electrode power supply.
In the technical scheme, by the way that the power factor correction module being made of four switching tubes is arranged, in conjunction with control mould
The control instruction of block output, control circuit executes rectifying operation or PFC operation respectively, as motor driven system
When the composition part of system, boosted by being alternately carried out " power-factor improvement movement " and " synchronous rectification movement ",
To achieve the purpose that improve the permission limit of motor speed, and during the work time, by increasing setting electric current in circuit
Mutual inductor and Hall current inductor, to detect running current, and detect there is current anomaly in the case where, control function
Rate factor correcting module stops working, and reruns after Abnormality remove, to guarantee the safety of motor driven process.
In the technical scheme, Hall current sensor is arranged by the ac input end in power factor correction module,
No matter rectifying operation or PFC operation are being executed, is thering is electric current to flow through Hall current sensor, thus detecting
To when having electric current to flow through hall device, which will export corresponding voltage, be switched according to the four of power factor correction module
The current value that pipe is able to bear sets in the over-current detection unit built in driving protective module or Hall current sensor and needs
The voltage value of protection, first switch tube are connected on firewire between zero curve in second switch, and third switching tube is in the 4th switch
Pipe is connected on firewire between zero curve, when first switch tube-second switch or the appearance of the-the four switching tube of third switching tube are different
When normal overcurrent, which will export relevant voltage by Hall current sensor and trigger driving protective module, and then turn off and open
The switching signal of drive module is closed, to protect the overcurrent for realizing switch tube, when overcurrent signal relief, drives protective module will
Control to excess flow switch drive module is released, to restore to work normally, thus during rectifying operation or power factor school
The timely and effectively detection to the higher failure of likelihood ratio can be achieved during just, to reach the peace for promoting entire pfc circuit
The purpose of full property.
For the circuit of power factor correction of Hall current sensor and sampling resistor, in different current flow paths
To be sampled based on Hall current sensor and/or sampling resistor to voltage, and determined according to the testing result of sampled voltage
With the presence or absence of short circuit phenomenon, therefore it can satisfy first switch tube in power factor correction module, second switch, third switch
The detection demand of the difference combination flow path of tetra- switching tube of Guan Yu.
In any of the above-described technical solution, optionally, the switch drive module includes for driving described first to open
The first switch drive module of third switching tube described in Guan Guanyu, and for driving the second switch to open with the described 4th
Close the second switch drive module of pipe, wherein if the driving protective module is detecting the sampled signal greater than the first peace
Full threshold value and/or the pressure drop are greater than the second secure threshold, then trigger the control module and close the first switch driving mould
The driving of block and the second switch drive module exports.
In the technical scheme, switch drive module includes first switch drive module and second switch drive module, with
Realize the half-bridge driven of H bridge reorganizer.
In addition, those skilled in the art can understand that, it is defeated that control module control switch drive module stops driving
When out, it is while controls first switch drive module and the stopping output of second switch drive module, i.e. two switch drive modules
Execution priority having the same.
Specifically, first switch tube and third switching tube are driven using first switch drive module, second switch and the
Four switching tubes are driven using second switch drive module, the sampled signal of Hall current sensor output and the voltage of sampling resistor
Sampled signal is all connected to driving protective module, when driving protective module detects the voltage of Hall current sensor output and adopts
The ohmically voltage sampling signal of sample will be forced shutdown first switch drive module and second switch drive module beyond preset value,
To four switching tubes of protection.
Wherein, Hall current sensor is mainly used for successively passing through first switch tube and second switch when electric current, or
Detection when short circuit exception occurs when electric current successively passes through third switching tube and four switching tubes, sampling resistor is mainly used for working as
Electric current successively passes through first switch tube and third switching tube, or when electric current successively passes through second switch and four switching tubes
Detection when short circuit exception occurs.
Wherein, those skilled in the art can understand that, the protection generated based on Hall current sensor triggering is believed
Number with based on sampling resistor triggering generate the protection priority of signal it is identical, it is any be abnormal all the way triggering driving protect
Module, overcurrent reason may by electromagnetism, perhaps surge interference causes control module crash reset or reactor to be sent out for circuit
Raw short circuit exception etc..
In any of the above-described technical solution, optionally, further includes: bus capacitor is connected to the PFC
The DC output end of module, and be arranged in parallel with the load drive module.
In any of the above-described technical solution, optionally, the control module is also used to: if the input of the AC power source
Voltage is in positive half cycle, then controls the switch drive module output for making the first switch tube and the 4th switching tube
The switching signal of conducting, and bypass corresponding freewheeling diode；The control module is also used to: if the input of the AC power source
Voltage is in negative half period, then controls the switch drive module output for making the second switch and the third switching tube
The switching signal of conducting, and corresponding freewheeling diode is bypassed, to realize synchronous rectification.
Wherein, there is freewheeling diode in the inside of first switch tube, freewheeling diode is the source electrode in first switch tube
The saturation voltage (the drain source voltage across poles under on-state) of the part of existing PN junction between drain electrode, first switch tube is low
In the positive voltage drop of freewheeling diode.Electric current is flowed through in the source drain of first switch tube as a result, and in parasitic two poles
It flows through electric current in pipe to compare, voltage drop becomes smaller, or even can reduce conduction losses.It is easy-to-understand to and says, the of on-state
Electric current is flowed through in one switching tube compared with flowing through electric current in the freewheeling diode in the first switch tube in off-state, makes to be connected
Loss becomes smaller, in addition, being also suitable for other second switches, third switching tube and the 4th switching tube.
In the technical scheme, open-minded according to the phase state of alternating current by the principle using metal-oxide-semiconductor low conduction voltage drop
Low-power consumption synchronous rectification can be realized in corresponding metal-oxide-semiconductor.
Specifically, control module carries out exporting corresponding control according to the current alternating current phases that zero crossing detection module detects
Signal processed drives corresponding switching tube to work.
In the related technology, when synchronizing rectification, in AC power source positive half cycle, electric current passes through Hall current sensor
And reactor, it is then rectified in the freewheeling diode of the 4th switching tube to system power supply by first switch tube, at this time due to continuous
It is larger to flow diode drop, causes energy waste.
In the technical scheme, control module judges to start in the positive half cycle of AC power source according to zero crossing detection module at this time
When, electric current passes through Hall current sensor and reactor, and output switching signal driving first switch tube is connected with the 4th switching tube,
Make to flow through that first switch tube, the electric current of freewheeling diode flows through metal-oxide-semiconductor on the 4th switching tube of sampling resistor, utilizes the low of metal-oxide-semiconductor
On state characteristic bypasses freewheeling diode, to reduce conduction loss.Similarly in AC power source negative half period, control module is then controlled
System opens second switch and third switching tube, and four metal-oxide-semiconductors is made to realize synchronous rectification, during synchronous rectification, leads to
It crosses to by the current detecting on Hall current sensor and sampling resistor, detects whether over-current phenomenon avoidance occur.
In any of the above-described technical solution, optionally, the control module is also used to: if the input of the AC power source
Voltage is in positive half cycle, then controls the third switching tube and described the according to the zero passage detection signal and the switching signal
The opening and closing of four switching tubes, the third switching tube is connected with the 4th switching tube, to charge to the reactor, turns off institute
Third switching tube and the 4th switching tube, the first switch tube conducting are stated, the reactor powers to the load；The control
Module is also used to: if the input voltage of the AC power source is in negative half period, being opened according to the zero passage detection signal with described
OFF signal controls the third switching tube and the 4th switching tube is opened and closed, and the third switching tube is led with the 4th switching tube
It is logical, to charge to the reactor, the third switching tube and the 4th switching tube are turned off, the second switch is driven
Pipe conducting, the reactor powers to the load, to realize PFC.
In the technical scheme, when circuit is used to carry out PFC operation, when input is in the positive half cycle of AC power source,
Control module drives third switching tube to be connected with the 4th switching tube, charges, filling to reactor according to zero passage detection signal
In electric process, short circuit phenomenon is determined whether by the electric current on detection Hall current sensor, when shutdown third switching tube
When with four switching tubes, control module drives first switch tube conducting, and the electric energy of reactor storage will be released by first switch tube
It puts to late-class circuit, to bus capacitor and load (such as motor) power supply, when input is in the negative half period of AC power source, control
Module is driven third switching tube to be connected with the 4th switching tube, charged to reactor according to zero passage detection signal, when turning off the
When three switching tubes and four switching tubes, control module drives second switch to open, and the electric energy of reactor storage will pass through second
Switching tube is released to late-class circuit, to bus capacitor and load (such as motor) power supply, by discharging to bus capacitor in reactance
The energy put aside in device boosts to the DC voltage of bus capacitor, so as to reduce current waveform by short circuit current
Distortion, make current waveform close to sine wave, and then the power factor of pfc circuit can be improved, further, by according to negative
The busbar voltage of load calculates the pulsewidth of third switching tube or first switch tube, can reasonably adjust pfc circuit short circuit currents
Duration rationally controls the number of each switch conduction/shutdown according to pulse change number, can reduce leading for switch unit
Logical loss, reduces switching loss, improves efficiency.
In any of the above-described technical solution, optionally, further includes: bus capacitor, one end connection of the bus capacitor
To the cathode output end, the other end of the bus capacitor is grounded, and switch drive module exports the switching signal, passes through institute
State that AC power source charges to the bus capacitor or bus capacitor electric discharge, switch drive module do not export the switch and believe
Number, the bus capacitor electric discharge.
In any of the above-described technical solution, optionally, further includes: load drive module is connected to the power factor
The DC output end of correction module, for receiving the direct current output of the power factor correction module, to load supplying；Direct current
Busbar voltage detection module, is connected to the DC output end of the power factor correction module, and with the load drive module
It is arranged in parallel, for detecting DC bus-bar voltage.
In the technical scheme, in the application scenarios that load is motor, load drive module is used for constant voltage DC is inverse
Become three-phase alternating current output, powered with realizing to motor, in conjunction with the setting of DC bus-bar voltage detection module, by power because
The detection of the busbar voltage of the direct current output of number correction module and the detection of the input voltage, control PFC mould
Pulsewidth in block when switch state and each switching tube conducting of each switching tube member.
In any of the above-described technical solution, optionally, the control module is additionally coupled to load drive module connection, with
For exporting inverter control signal to the load drive module.
Embodiment according to the second aspect of the invention provides a kind of air conditioner, comprising: such as first aspect present invention skill
Circuit of power factor correction described in art scheme.
Specifically, circuit of power factor correction is applied in the motor driven systems of compressor, by being in detection circuit
It is no over-current phenomenon avoidance occur, it causes motor speed too fast when preventing overcurrent, compressor is caused demagnetization phenomenon occur.
Additional aspect and advantage of the invention will provide in following description section, will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, in which:
Fig. 1 shows the schematic diagram of circuit of power factor correction in the related technology；
Fig. 2 shows the schematic diagrames of circuit of power factor correction according to an embodiment of the invention.
Specific embodiment
To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawing and specific real
Applying mode, the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application
Feature in example and embodiment can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
To be implemented using other than the one described here other modes, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
Embodiment one
As shown in Fig. 2, circuit of power factor correction according to an embodiment of the invention, is suitable for air conditioner, comprising:
Power factor correction module 10, receives power supply signal, and the power factor correction module 10 includes switching tube, the switching tube quilt
It is configured to control the power supply signal to load supplying；Switch drive module is connected to the power factor correction module 10
Input terminal is driven, is used for 10 output switching signal of power factor correction module；Control module 30 is connected to the switch
Drive module, for controlling, the switch drive module opens the output switching signal or closing exports the switching signal；
Hall current sensor 40 is set to the exchange input side of the power factor correction module 10, to acquire input current, and will
The input current is determined as sampled signal；Protective module 50 is driven, with the Hall current sensor 40 and the control
Module 30 connects, and the sampled signal is if more than the first secure threshold, then described to the 30 output protection signal of control module
Protection signal is for triggering the output that the control module 30 closes the switch drive module.
In this embodiment, Hall current sensor 40 is set in the ac input end of power factor correction module 10, suddenly
Position of that current sensor 40 based on setting acquires the input current of power factor correction module 10, or output electric current, and will
Electric current is converted in sampled signal output driving protective module 50, to detect whether that overcurrent occur shows by driving protective module 50
As, with detecting that control stops to 10 output switching signal of power factor correction module in the case where there is over-current phenomenon avoidance, one
Aspect can not consume the power of tested power supply, therefore since Hall current sensor 40 is not in electrical contact with circuit-under-test
The efficient low power consumption control of frequency conversion equipment is not influenced, on the other hand, since Hall current sensor 40 directly acquires power factor
The input terminal electric current of correction module 10, and input terminal is connected to the firewire and zero line side N of AC power source, therefore can more directly
The rectifier that detects whether there is exception, and determine occur abnormal when, can determine under different operating conditions corresponding
Exceptional part, it is middle compared with the existing technology that over-current detection is carried out using the driving chip combination sampling resistor Rs with defencive function
Scheme, limitation is smaller, and more have specific aim and practicability.
Wherein, Hall current sensor 40 is that high current is transformed to secondary small sampled signal using Hall effect
Sensor, small sampled signal is enlarged into normal voltage, that is to say, that Hall current sensor by and associative operation amplifier
40 externally export sampled signal, and are compared with the secure threshold built in driving protective module 50, according to the result of the comparison really
Determine whether occur short circuit overcurrent phenomenon in circuit, since Hall current sensor 40 can both measure exchange, can also measure straight
Stream, therefore the exchange input side in power factor correction module 10 both can be set, it also can be set in PFC mould
The DC output side of block 10.
Embodiment two
As shown in Fig. 2, in the above-described embodiments, optionally, also being wrapped on the basis of Hall current sensor 40 are arranged
Include: the cathode output end of the power factor correction module 10 is arranged in sampling resistor Rs, and is connected to the driving protection mould
Block 50, the driving protective module 50 are detecting that the pressure drop on the sampling resistor Rs is more than the second secure threshold, Xiang Suoshu
Control module 30 exports the protection signal.
In this embodiment, by one Hall current sensor of the exchange side of power factor correction module 10 series connection
40, for being responsible for the electric current of detection exchange side, the sampled signal for then exporting the sensor is as driving protective module 50
Input signal is incorporated in cathode output end concatenated sampling resistor Rs, the sampling resistor Rs inspection of power factor correction module 10
The voltage of survey also inputs driving protective module 50, when any one of input voltage of this two-way is more than current detecting and driving protection
When the predeterminated voltage of module 50, all trigger current is detected and is driven protection and the switch-off power factor correcting of protective module 50
Block 10.
In any of the above-described embodiment, optionally, further includes: reactor L1 is set to the PFC mould
Between block 10 and AC power source；Zero crossing detection module 60 is arranged between the zero line L of the AC power source and zero line side N, and
It is connected to the control module 30, the zero crossing detection module 60 is for acquiring between the zero line L and the zero line side N
Zero passage detection signal；The control module 30 is also used to: the zero passage detection signal exported according to the zero crossing detection module 60 is true
The phase state of the fixed AC power source, to be believed according to the phase state to rectification driving voltage output switch control
Number, it is charged with control to the reactor L1.
In this embodiment by reactor L1 is arranged in the ac input end of power factor correction module 10 with exchange
Between power supply, when AC power source carries out exchange output, the electric energy supplied from AC power source can be converted to magnetic by reactor L1
Can be using as energy stores, and the boosting of pfc circuit and the improvement of power factor can be realized by discharging the energy.
Specifically, by the way that zero crossing detection module 60 is arranged between firewire and zero curve, to be judged by zero crossing detection module 60
The real-time phase of AC power source, so as to according to derailing switch different in different phase state driving power factor correcting modules 10
Part executes switch operation, to realize rectification function or PFC (PFC) function respectively, to be realized based on rectification function
The direct current supply of load end, or controlled by PFC, make to exchange side voltage and ac-side current reaches consistent in phase.
In addition, there are many reason of generating over-current phenomenon avoidance, for example circuit is interfered and causes 30 crash reset of control module, or
Short circuit exception etc. occurs for person's reactor L1.
Embodiment three
As shown in Fig. 2, optionally, the power factor correction module 10 is opened by first in any of the above-described embodiment
It closes pipe Q1, second switch Q2, third switching tube Q3 to construct to be formed with the 4th switching tube Q4, first switch tube Q1 and second switch
Pipe Q2 is set to the top of power factor correction module 10, and third switching tube Q3 and the 4th switching tube Q4 are set to power factor school
The lower part of positive module 10, first switch tube Q1 and third switching tube Q3 are set to the left part of power factor correction module 10, and second
Switching tube Q2 and the 4th switching tube Q4 is set to the right part of power factor correction module 10, the first switch tube Q1, described
Two switching tube Q2, the third switching tube Q3 and the 4th switching tube Q4 reverse parallel connection have freewheeling diode, by described first
The drain electrode of switching tube Q1 and the drain series of the second switch Q2, and tie point is determined as the PFC mould
The cathode output end of block, by the source series of the source electrode of the third switching tube Q3 and the 4th switching tube Q4, and by tie point with
It is grounded after the sampling resistor Rs series connection, by the drain electrode string of the source electrode of the first switch tube Q1 and the third switching tube Q3
Connection, and tie point is connected to the zero line L, by the leakage of the source electrode of the second switch Q2 and the 4th switching tube Q4
Pole series connection, and tie point is connected to the zero line side N.
Specifically, first switch tube Q1, second switch Q2, third switching tube Q3 and the 4th switching tube Q4 all can be
MOSFT (Mta-Oxid-Smicoductor Fid-ffct TrasIstor, Metal Oxide Semiconductor Field Effect Transistor, i.e.,
Metal-oxide-semiconductor), such as superjunction MOSFT or SiC-MOSFT.
The working method of metal-oxide-semiconductor, controls on-off between source electrode and drain electrode by grid and realizes and switch, and when conducting needs grid
Power supply is greater than source electrode power supply.
In this embodiment, by the way that the power factor correction module 10 being made of four switching tubes is arranged, in conjunction with control mould
The control instruction that block 30 exports, control circuit executes rectifying operation or PFC operation respectively, as motor driven
When the composition part of system, risen by being alternately carried out " power-factor improvement movement " and " synchronous rectification movement "
Pressure, to achieve the purpose that improve the permission limit of motor speed, and during the work time, by increasing setting electricity in circuit
Current transformer and Hall current inductor, to detect running current, and detect there is current anomaly in the case where, control
Power factor correction module 10 stops working, and reruns after Abnormality remove, to guarantee the safety of motor driven process.
In this embodiment, Hall current sensor is arranged by the ac input end in power factor correction module 10
40, no matter rectifying operation or PFC operation are being executed, is thering is electric current to flow through Hall current sensor 40, thus
When having detected that electric current flows through hall device, which will export corresponding voltage, according to the four of power factor correction module 10
The current value that a switching tube is able to bear, in the over-current detection unit built in driving protective module 50 or Hall current sensor 40
Middle setting needs voltage value to be protected, and first switch tube Q1 is connected on firewire between zero curve in second switch Q2, and third is opened
It closes pipe Q3 and is connected on firewire between zero curve in the 4th switching tube Q4, when first switch tube Q1- second switch Q2 or third
When abnormal overcurrent occurs in the 4th switching tube Q4 of switching tube Q3-, which will export relevant voltage by Hall current sensor 40
And driving protective module 50 is triggered, and then turn off the switching signal of switch drive module, to protect the mistake for realizing switch tube
Stream drives control of the protective module 50 by releasing to excess flow switch drive module, when overcurrent signal relief to restore normal work
Make, to can be achieved to the timely of the higher failure of likelihood ratio during rectifying operation or during PFC
Effective detection, to achieve the purpose that promote the safety of entire pfc circuit.
For the circuit of power factor correction of Hall current sensor 40 and sampling resistor Rs, in different current flow paths
Voltage can be sampled based on Hall current sensor 40 and/or sampling resistor Rs, and according to the detection of sampled voltage
As a result short circuit phenomenon is determined whether there is, therefore can satisfy first switch tube Q1 in power factor correction module 10, second open
Close the detection demand of pipe Q2, third switching tube Q3 flow path in conjunction with the difference of the 4th switching tube Q4.
In any of the above-described embodiment, optionally, the switch drive module includes for driving the first switch
The first switch drive module 202 of pipe Q1 and the third switching tube Q3, and for driving the second switch Q2 and institute
State the second switch drive module 204 of the 4th switching tube Q4, wherein if the driving protective module 50 is detecting the sampling
Signal is greater than the first secure threshold and/or the pressure drop is greater than the second secure threshold, then triggers the control module 30 and close institute
The driving for stating first switch drive module 202 and the second switch drive module 204 exports.
In this embodiment, switch drive module includes first switch drive module 202 and second switch drive module
204, to realize the half-bridge driven of H bridge reorganizer.
In addition, those skilled in the art can understand that, 30 control switch drive module of control module stops driving
When output, it is while controls first switch drive module 202 and the stopping output of second switch drive module 204, i.e., two switches
Drive module execution priority having the same.
In any of the above-described embodiment, optionally, further includes: bus capacitor E is connected to the PFC mould
The DC output end of block 10, and be arranged in parallel with the load drive module 70.
Example IV
As shown in Fig. 2, optionally, the Hall current sensor 40 is arranged described in any of the above-described embodiment
Between AC power source and the reactor L1；The driving protective module 50 is also used to: if detecting, the sampled signal is greater than
First secure threshold then exports the protection signal to the control module 30, to close the output of the switch drive module.
Wherein, Hall current sensor 40 can be placed in any position of the concatenated firewire of reactor L1 or zero curve.
In this embodiment, Hall current sensor is arranged by the ac input end in power factor correction module 10
40, no matter rectifying operation or PFC operation are being executed, is thering is electric current to flow through Hall current sensor 40, thus
When having detected that electric current flows through hall device, which will export corresponding voltage, according to the four of power factor correction module 10
The current value that a switching tube is able to bear, in the over-current detection unit built in driving protective module 50 or Hall current sensor 40
Middle setting needs voltage value to be protected, and first switch tube Q1 is connected on firewire between zero curve in second switch Q2, and third is opened
It closes pipe Q3 and is connected on firewire between zero curve in the 4th switching tube Q4, when first switch tube Q1- second switch Q2 or third
When abnormal overcurrent occurs in the 4th switching tube Q4 of switching tube Q3-, which will export relevant voltage by Hall current sensor 40
And driving protective module 50 is triggered, and then turn off the switching signal of switch drive module, to protect the mistake for realizing switch tube
Stream drives control of the protective module 50 by releasing to excess flow switch drive module, when overcurrent signal relief to restore normal work
Make, to can be achieved to the timely of the higher failure of likelihood ratio during rectifying operation or during PFC
Effective detection, to achieve the purpose that promote the safety of entire pfc circuit.
For the circuit of power factor correction of Hall current sensor 40 and sampling resistor Rs, in different current flow paths
Voltage can be sampled based on Hall current sensor 40 and/or sampling resistor Rs, and according to the detection of sampled voltage
As a result short circuit phenomenon is determined whether there is, therefore can satisfy first switch tube Q1 in power factor correction module 10, second open
Close the detection demand of pipe Q2, third switching tube Q3 flow path in conjunction with the difference of the 4th switching tube Q4.
First switch tube Q1 and third switching tube Q3 are driven using first switch drive module 202, second switch Q2 and
4th switching tube Q4 is driven using second switch drive module 204, the sampled signal and sampling that Hall current sensor 40 exports
The voltage sampling signal of resistance Rs is all connected to driving protective module 50, when driving protective module 50 detects that Hall current senses
The voltage sampling signal on voltage and sampling resistor Rs that device 40 exports will be forced shutdown first switch driving mould beyond preset value
Block 202 and second switch drive module 204, thus four switching tubes of protection.
Wherein, Hall current sensor 40 is mainly used for successively passing through first switch tube Q1 and second switch when electric current
Q2, or the detection when electric current successively passes through third switching tube Q3 and the 4th switching tube Q4 when generation short circuit exception, sampling electricity
Resistance Rs is mainly used for successively passing through first switch tube Q1 and third switching tube Q3 when electric current, or opens when electric current successively passes through second
Detection when short circuit exception occurs when closing pipe Q2 and the 4th switching tube Q4.
Wherein, those skilled in the art can understand that, the protection generated is triggered based on Hall current sensor 40
Signal is identical as the protection priority of signal generated based on sampling resistor Rs triggering, any to be abnormal triggering driving all the way
Protective module 50, overcurrent reason may for circuit by electromagnetism perhaps surge interference cause 30 crash reset of control module or
Short circuit exception etc. occurs for reactor L1.
Embodiment five
In any of the above-described embodiment, optionally, the control module 30 is also used to: if the input of the AC power source
Voltage is in positive half cycle, then controls the switch drive module output for making the first switch tube Q1 and the 4th switch
The switching signal of pipe Q4 conducting, and bypass corresponding freewheeling diode；The control module 30 is also used to: if the AC power source
Input voltage be in negative half period, then control switch drive module output for making the second switch Q2 and described the
The switching signal of three switching tube Q3 conducting, and corresponding freewheeling diode is bypassed, to realize synchronous rectification.
Wherein, there is freewheeling diode in the inside of first switch tube Q1, freewheeling diode is in first switch tube Q1
The part of existing P knot, the saturation voltage of first switch tube Q1 are (electric between the drain-source under on-state between source electrode and drain electrode
Pressure) lower than the positive voltage drop of freewheeling diode.Electric current is flowed through in the source drain of first switch tube Q1 as a result, and is being posted
It flows through electric current in raw diode to compare, voltage drop becomes smaller, or even can reduce conduction losses.It is easy-to-understand to and says, is connecting shape
Electric current is flowed through in the first switch tube Q1 of state and flows through electric current in the freewheeling diode in the first switch tube Q1 of off-state
It compares, conduction losses is made to become smaller, in addition, for other second switch Q2, third switching tube Q3 and the 4th switching tube Q4
It is applicable in.
In this embodiment, by the principle using metal-oxide-semiconductor low conduction voltage drop, phase is opened according to the phase state of alternating current
Low-power consumption synchronous rectification can be realized in the metal-oxide-semiconductor answered.
It is answered specifically, the current alternating current phases that control module 30 is detected according to zero crossing detection module 60 carry out output phase
Control signal, drive corresponding switching tube to work.
In the related technology, when synchronizing rectification, in AC power source positive half cycle, electric current passes through Hall current sensor
Then 40 and reactor L1 is rectified in the freewheeling diode of the 4th switching tube Q4 to system power supply by first switch tube Q1, this
When due to freewheeling diode pressure drop it is larger, cause energy waste.
In this embodiment, control module 30 judges to open in the positive half cycle of AC power source according to zero crossing detection module 60 at this time
When the beginning, electric current passes through Hall current sensor 40 and reactor L1, and output switching signal driving first switch tube Q1 is opened with the 4th
Pipe Q4 conducting is closed, makes to flow through first switch tube Q1, sampling resistor Rs and the electric current of freewheeling diode on the 4th switching tube Q4 flows through
Metal-oxide-semiconductor bypasses freewheeling diode, to reduce conduction loss using the low on state characteristic of metal-oxide-semiconductor.It is similarly negative in AC power source
When half cycle, control module 30 then controls and opens second switch Q2 and third switching tube Q3, and four metal-oxide-semiconductors is made to realize synchronous rectification
Function, during synchronous rectification, by by the current detecting on Hall current sensor 40 and sampling resistor Rs, detection
Whether over-current phenomenon avoidance is occurred.
Embodiment six
In any of the above-described embodiment, optionally, the control module 30 is also used to: if the input of the AC power source
Voltage is in positive half cycle, then according to the zero passage detection signal and the switching signal control the third switching tube Q3 with it is described
4th switching tube Q4 opening and closing, the third switching tube Q3 are connected with the 4th switching tube Q4, to carry out to the reactor L1
Charging turns off the third switching tube Q3 and the 4th switching tube Q4, the first switch tube Q1 conducting, the reactor L1
It powers to the load；The control module 30 is also used to: if the input voltage of the AC power source is in negative half period, according to
Zero passage detection signal and the switching signal control the third switching tube Q3 and the 4th switching tube Q4 and are opened and closed, the third
Switching tube Q3 is connected with the 4th switching tube Q4, to charge to the reactor L1, turns off the third switching tube Q3
With the 4th switching tube Q4, the second switch Q2 is driven to be connected, the reactor L1 powers to the load, to realize power
Factor correcting.
In this embodiment, in circuit for when input is in the positive half cycle of AC power source, controlling when carrying out PFC operation
Molding block 30 drives third switching tube Q3 to be connected with the 4th switching tube Q4, fills to reactor L1 according to zero passage detection signal
Electricity, when turning off third switching tube Q3 and the 4th switching tube Q4, control module 30 drives first switch tube Q1 to open, reactor L1
The electric energy of storage will be released to late-class circuit by first switch tube Q1, power to bus capacitor E and load (such as motor),
When input is in the negative half period of AC power source, control module 30 drives third switching tube Q3 and the 4th according to zero passage detection signal
Switching tube Q4 conducting, charges to reactor L1, when turning off third switching tube Q3 and the 4th switching tube Q4, control module 30
Second switch Q2 is driven to open, the electric energy of reactor L1 storage will be released to late-class circuit by second switch Q2, to mother
Line capacitance E and load (such as motor) power supply, by discharging the energy put aside in reactor L1 to bus capacitor E, to bus
The DC voltage of capacitor E boosts, so as to reduce the distortion of current waveform, connect current waveform by short circuit current
Nearly sine wave, and then the power factor of pfc circuit can be improved, further, by calculating the according to the busbar voltage of load
The pulsewidth of three switching tube Q3 or first switch tube Q1, can reasonably adjust the duration of pfc circuit short circuit currents, according to arteries and veins
The number that change frequency rationally controls each switch conduction/shutdown is rushed, can reduce the conduction losses of switch unit, reduces switch
Loss, improves efficiency.
In any of the above-described embodiment, optionally, further includes: one end of bus capacitor E, the bus capacitor E connect
To the cathode output end, the other end of the bus capacitor E is grounded, and switch drive module exports the switching signal, is passed through
The AC power source charges to the bus capacitor E or bus capacitor E electric discharge, and switch drive module does not export described open
OFF signal, the bus capacitor E electric discharge.
In any of the above-described embodiment, optionally, further includes: load drive module 70 is connected to the power factor
The DC output end of correction module 10, for receiving the direct current output of the power factor correction module 10, to load supplying；
DC bus-bar voltage detection module (not shown) is connected to the DC output end of the power factor correction module 10, and
It is arranged in parallel with the load drive module 70, for detecting DC bus-bar voltage.
In this embodiment, in the application scenarios that load is motor, load drive module 70 is used for constant voltage DC is inverse
Become three-phase alternating current output, powered with realizing to motor, in conjunction with the setting of DC bus-bar voltage detection module, by power because
The detection of the busbar voltage of the direct current output of number correction module 10 and the detection of the input voltage, control PFC
Pulsewidth in module 10 when switch state and each switching tube conducting of each switching tube member.
In any of the above-described embodiment, optionally, the control module 30 is additionally coupled to load drive module 70 and connects,
For exporting inverter control signal to the load drive module 70.
The air conditioner of embodiment according to the present invention, comprising: the electricity of PFC described in any of the above-described embodiment
Road.
Specifically, circuit of power factor correction is applied in the motor driven systems of compressor, by being in detection circuit
It is no over-current phenomenon avoidance occur, it causes motor speed too fast when preventing overcurrent, compressor is caused demagnetization phenomenon occur.
Compared with prior art, embodiment disclosed in technical scheme at least have it is following the utility model has the advantages that
(1) since Hall current sensor directly acquires the input terminal electric current of power factor correction module, make power factor
Correction module corresponding different current flow paths when executing different feature operations can be carried out by Hall current sensor
Circuit abnormality detection, therefore can more directly detect whether rectifier exception occurs, and when determining that appearance is abnormal,
It can determine corresponding exceptional part under different operating conditions, it is middle using the driving core with defencive function compared with the existing technology
Piece combination sampling resistor carries out the scheme of over-current detection, and limitation is smaller, and more has specific aim and practicability.
(2) by the exchange side of power factor correction module connect a Hall current sensor, for being responsible for detection
The electric current of side is exchanged, the sampled signal for then exporting the sensor is incorporated in function as the input signal of driving protective module
The concatenated sampling resistor of cathode output end of rate factor correcting module, the voltage of sampling resistor detection also input driving protection mould
Block all will triggering when any one of input voltage of this two-way is more than current detecting and drives the predeterminated voltage of protective module
Current detecting and protection and the switch-off power factor correcting module for driving protective module, to may be implemented in input and output side
To the detection function of over-current phenomenon avoidance.
(3) for the circuit of power factor correction of Hall current sensor and sampling resistor, in different current flow paths
Voltage can be sampled based on Hall current sensor and/or sampling resistor, and according to the testing result of sampled voltage
Short circuit phenomenon is determined whether there is, therefore can satisfy first switch tube in power factor correction module, second switch, third
The detection demand of switching tube flow path in conjunction with the difference of the 4th switching tube.
The technical scheme of the present invention has been explained in detail above with reference to the attached drawings, by the exchange side of power factor correction module
It connects a Hall current sensor, for being responsible for the electric current of detection exchange side, the sampled signal for then exporting the sensor
As the input signal of driving protective module, it is incorporated in the concatenated sampling resistor of cathode output end of power factor correction module,
The voltage of sampling resistor detection also inputs driving protective module, when any one of input voltage of this two-way is more than current detecting
And when driving the predeterminated voltage of protective module, all trigger current is detected and is driven protection and the switch-off power factor of protective module
Correction module.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
It should be noted that in the claims, any reference symbol between parentheses should not be configured to power
The limitation that benefit requires.Word "comprising" does not exclude the presence of component or step not listed in the claims.Before component
Word "a" or "an" does not exclude the presence of multiple such components.The present invention can be by means of including several different components
It hardware and is realized by means of properly programmed computer.If in the module claim for listing equipment for drying, these dresses
Several in setting, which can be, to be embodied by the same item of hardware.The use of word first, second, and third is not
Indicate any sequence.These words can be construed to title.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from right of the present invention by those skilled in the art
It is required that and its within the scope of equivalent technologies, then the present invention is also intended to include these modifications and variations.
Claims (11)
1. a kind of circuit of power factor correction characterized by comprising
Power factor correction module receives power supply signal, and the power factor correction module includes switching tube, the switching tube quilt
It is configured to control the power supply signal to load supplying；
Switch drive module is connected to the driving input terminal of the power factor correction module, is used for the power factor school
Positive module output switching signal；
Control module is connected to the switch drive module, opens the output switch for controlling the switch drive module
Signal closes the output switching signal；
Current sensor is set to the input side of the power factor correction module, to acquire input current, and by the input
Electric current is determined as sampled signal；
Protective module is driven, is connect with the current sensor and the control module, the sampled signal is if more than first
Secure threshold, then to the control module output protection signal, the protection signal closes institute for triggering the control module
State the output of switch drive module.
2. circuit of power factor correction according to claim 1, which is characterized in that further include:
Sampling resistor, is arranged in the cathode output end of the power factor correction module, and is connected to the driving protective module,
The driving protective module is detecting that the pressure drop on the sampling resistor is more than the second secure threshold, and Xiang Suoshu control module is defeated
The protection signal out.
3. circuit of power factor correction according to claim 2, which is characterized in that further include:
Reactor is set between the power factor correction module and AC power source；
Zero crossing detection module is arranged between the zero line and zero line side of the AC power source, and is connected to the control module,
The zero crossing detection module is used to acquire the zero passage detection signal between the zero line and the zero line side；
The control module is also used to: determining the AC power source according to the zero passage detection signal that the zero crossing detection module exports
Phase state, with according to the phase state to the rectification driving voltage output switch control signal, to control to described
Reactor charges,
The AC power source is for exporting the power supply signal.
4. circuit of power factor correction according to claim 3, which is characterized in that
The current sensor is arranged between the AC power source and the reactor；
The driving protective module is also used to: if detecting, the sampled signal is greater than the first secure threshold, to the control
Module exports the protection signal, to close the output of the switch drive module.
5. circuit of power factor correction according to claim 4, which is characterized in that
The power factor correction module constructs shape by first switch tube, second switch, third switching tube and the 4th switching tube
At the first switch tube, the second switch, the third switching tube and the 4th switching tube reverse parallel connection have afterflow
Diode by drain electrode and the drain series of the second switch of the first switch tube, and tie point is determined as described
The cathode output end of power factor correction module will by the source series of the source electrode of the third switching tube and the 4th switching tube
Tie point is determined as the cathode output end, to be grounded after connecting with the sampling resistor, by the source electrode of the first switch tube
With the drain series of the third switching tube, and tie point is connected to the zero line, by the source electrode of the second switch
With the drain series of the 4th switching tube, and tie point is connected to the zero line side.
6. circuit of power factor correction according to claim 5, which is characterized in that
The switch drive module includes for driving the first switch of the first switch tube and the third switching tube to drive
Module, and the second switch drive module for driving the second switch Yu the 4th switching tube,
Wherein, if the driving protective module is detecting the sampled signal greater than the first secure threshold and/or the pressure drop
Greater than the second secure threshold, then triggers the control module and close the first switch drive module and second switch driving
The driving of module exports.
7. circuit of power factor correction according to claim 5, which is characterized in that
The control module is also used to: if the input voltage of the AC power source is in positive half cycle, controlling the switch driving
Module exports the switching signal for the first switch tube to be connected with the 4th switching tube, and bypasses corresponding afterflow two
Pole pipe；
The control module is also used to: if the input voltage of the AC power source is in negative half period, controlling the switch driving
Module exports the switching signal for the second switch to be connected with the third switching tube, and bypasses corresponding afterflow two
Pole pipe, to realize synchronous rectification.
8. circuit of power factor correction according to claim 5, which is characterized in that
The control module is also used to: if the input voltage of the AC power source is in positive half cycle, according to the zero passage detection
Signal and the switching signal control the third switching tube and the 4th switching tube is opened and closed, the third switching tube with it is described
The conducting of 4th switching tube, to charge to the reactor, turns off the third switching tube and the 4th switching tube, described
First switch tube conducting, the reactor power to the load；
The control module is also used to: if the input voltage of the AC power source is in negative half period, according to the zero passage detection
Signal and the switching signal control the third switching tube and the 4th switching tube is opened and closed, the third switching tube with it is described
The conducting of 4th switching tube, to charge to the reactor, turns off the third switching tube and the 4th switching tube, drives
The second switch conducting, the reactor powers to the load, to realize PFC.
9. circuit of power factor correction according to claim 5, which is characterized in that further include:
Bus capacitor, one end of the bus capacitor are connected to the cathode output end, and the other end of the bus capacitor is grounded,
Switch drive module exports the switching signal, is charged by the AC power source to the bus capacitor or the bus is electric
Discharge capacitor, switch drive module do not export the switching signal, the bus capacitor electric discharge.
10. circuit of power factor correction according to any one of claim 1 to 8, which is characterized in that further include:
Drive module is loaded, the DC output end of the power factor correction module is connected to, for receiving the power factor
The direct current output of correction module, to load supplying；
The control module is additionally coupled to load drive module connection, for exporting inversion control to the load drive module
Signal.
11. a kind of air conditioner characterized by comprising the PFC electricity as described in any one of claims 1 to 10
Road.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910415198.2A CN109980915A (en) | 2019-05-17 | 2019-05-17 | Circuit of power factor correction and air conditioner |
| JP2021568807A JP2022534367A (en) | 2019-05-17 | 2019-11-11 | Power factor correction circuit and air conditioner |
| PCT/CN2019/117017 WO2020232995A1 (en) | 2019-05-17 | 2019-11-11 | Power factor correction circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910415198.2A CN109980915A (en) | 2019-05-17 | 2019-05-17 | Circuit of power factor correction and air conditioner |
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| Publication Number | Publication Date |
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| CN109980915A true CN109980915A (en) | 2019-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910415198.2A Pending CN109980915A (en) | 2019-05-17 | 2019-05-17 | Circuit of power factor correction and air conditioner |
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| CN111391611A (en) * | 2020-03-25 | 2020-07-10 | 广州华凌制冷设备有限公司 | Operation detection method, operation detection device, vehicle-mounted air conditioner and storage medium |
| CN111404367A (en) * | 2020-04-17 | 2020-07-10 | 广东美的制冷设备有限公司 | PFC circuit, circuit board and air conditioner |
| WO2020232995A1 (en) * | 2019-05-17 | 2020-11-26 | 广东美的制冷设备有限公司 | Power factor correction circuit and air conditioner |
| CN112583287A (en) * | 2020-12-18 | 2021-03-30 | 中国长城科技集团股份有限公司 | Control unit of active bridge rectifier circuit and rectifier device |
| CN114301028A (en) * | 2021-12-29 | 2022-04-08 | 合肥视涯技术有限公司 | Overcurrent protection circuit and display device |
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