CN110417251A - Pfc circuit and air conditioner - Google Patents
Pfc circuit and air conditioner Download PDFInfo
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- CN110417251A CN110417251A CN201910618776.2A CN201910618776A CN110417251A CN 110417251 A CN110417251 A CN 110417251A CN 201910618776 A CN201910618776 A CN 201910618776A CN 110417251 A CN110417251 A CN 110417251A
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- pfc
- circuit
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- resistance
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—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
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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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4258—Arrangements for improving power factor of AC input using a single converter stage both for correction of AC input power factor and generation of a regulated and galvanically isolated DC output voltage
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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
It includes: reactor that the present invention, which discloses a kind of pfc circuit and air conditioner, the pfc circuit,；Rectification circuit；PFC driving circuit exports corresponding PFC driving signal according to the control signal received；PFC switching circuit exports the power supply that the first input/output terminal accesses to the second input/output terminal according to PFC driving signal, or the power supply that the second input/output terminal accesses is exported to the first input/output terminal；Current foldback circuit, the test side of current foldback circuit are connect with the second input/output terminal of PFC switching circuit, and the output end of current foldback circuit is connect with PFC driving circuit；Current foldback circuit, when detecting that the electric current for flowing through PFC switching circuit reaches predetermined current threshold, control PFC driving circuit stops output PFC driving signal.The present invention improves the reliability of pfc circuit, and the loss for solving pfc circuit is big, the low problem of efficiency.
Description
Technical field
The present invention relates to pfc circuit technical field, in particular to a kind of pfc circuit and air conditioner.
Background technique
It is existing that PFC (Power Factor Correction, power factor school are typically led in electron electric power equipment
On the one hand just) circuit can improve power supply to the utilization rate of alternating current by pfc circuit when exchange is converted to direct current, reduce and turn
The electric energy loss of process is changed, it can be energy saving with this；It on the other hand, can also be humorous in power grid to reduce by pfc circuit
Wave pollution.
Currently, pfc circuit generally uses bridge heap to convert alternating current to direct current, then boosted using BOOST booster circuit, with
This realizes PFC, however, the volume of bridge heap is larger, on-state loss is big, is easy to cause the loss of pfc circuit big, energy
It imitates low.Also, pfc circuit is for Primary Component, such as switching tube etc., and not set protected mode, spoilage is higher, this is also corresponded to
A degree of influence is caused with the reliability that the electronic product of the pfc circuit works.
Summary of the invention
The main object of the present invention is to propose a kind of pfc circuit and air conditioner, it is intended to reduce the power consumption of pfc circuit, improve
The reliability of pfc circuit.
To achieve the above object, the present invention proposes that a kind of pfc circuit, the pfc circuit include:
Reactor, one end of the reactor and the zero line of AC power source connect；
Rectification circuit, the input terminal of the rectification circuit are connect with the other end of the reactor；
PFC driving circuit exports corresponding PFC driving signal according to the control signal received；
PFC switching circuit, the controlled end of the PFC switching circuit is connect with the output end of the PFC driving circuit, described
First input/output terminal of PFC switching circuit is connect with the other end of the reactor；The second of the PFC switching circuit is defeated
Enter/output end connect with the zero line side of the AC power source；The PFC switching circuit, will be described according to the PFC driving signal
The power supply of first input/output terminal access is exported to second input/output terminal, or by second input/output terminal
The power supply of access is exported to first input/output terminal；
Current foldback circuit, the second input/output of the test side of the current foldback circuit and the PFC switching circuit
End connection, the output end of the current foldback circuit are connect with the PFC driving circuit；The current foldback circuit is detecting
When reaching predetermined current threshold to the electric current for flowing through the PFC switching circuit, controls the PFC driving circuit and stop output PFC
Driving signal.
Optionally, the PFC driving circuit includes the first driving switch, first resistor, second resistance and signal isolator
Part, the first end of the first resistor are the controlled end of the PFC driving circuit, the second end of the first resistor and described the
The interconnection of the first end of the controlled end of one driving switch and the second resistance；The input terminal of first driving switch and described
The second end of two resistance is connect with the first DC power supply, the output end of first driving switch and the signal isolation device
Input terminal connection, the output end of the signal isolation device are the output end of the PFC driving circuit.
Optionally, the PFC switching circuit includes first switch tube and first diode, the first switch tube it is controlled
End is the controlled end of the FC switching circuit, the input terminal of the first switch tube be the PFC switching circuit the first input/
Output end, the output end of the first switch tube are connect with the anode of the first diode, the cathode of the first diode
For the second input/output terminal of the PFC switching circuit.
Optionally, the PFC switching circuit includes second switch and the second diode, the second switch it is controlled
End is the controlled end of the FC switching circuit, the anode of second diode be the PFC switching circuit the first input/it is defeated
The cathode of outlet, second diode is connect with the input terminal of the second switch；The output end of the second switch
For the second input/output terminal of the PFC switching circuit.
Optionally, the PFC switching circuit includes third switching tube and the 4th switching tube, the third switching tube it is controlled
The controlled end of end and the 4th switching tube is connect with the output end of the PFC driving circuit, and the first of the third switching tube
Conducting end is the first input/output terminal of the PFC switching circuit, the second conducting end of the third switching tube and the described 4th
First conducting end of switching tube connects, the second conducting end of the 4th switching tube be the PFC switching circuit the second input/
Output end.
Optionally, the PFC switching circuit further includes third diode and the 4th diode, the sun of the third diode
Pole is connect with the first conducting end of the 4th switching tube, and the cathode of the third diode is connect with the reactor；It is described
The anode of 4th diode is connect with the second conducting end of the third switching tube, the cathode and alternating current of the 4th diode
The zero line in source connects.
Optionally, the current foldback circuit includes current detecting unit and compares control unit, the current detecting list
The test side of member is the test side of the current foldback circuit, and the output end of the current detecting unit controls single compared with described
Second input terminal of the first input end connection of member, the relatively control unit accesses reference current signal, described relatively to control
The output end of unit is the output end of the current foldback circuit；Wherein, the current detecting unit, the exchange for will test
Electric current signal exports after being converted to the DC current flow signal of corresponding size, the relatively control unit, for described straight
When galvanic current signal is greater than the reference current signal, controls the PFC driving circuit and stop output PFC driving signal.
Optionally, the current detecting unit includes transformer, A.C.-D.C. converter, 3rd resistor and the 4th resistance,
One end of the primary coil of the transformer is connect with the second input/output terminal of the PFC switching circuit, the transformer
The other end of primary coil is grounded；Two inputs at the both ends of the secondary transformer and the A.C.-D.C. converter
End connects one to one；First output end of the A.C.-D.C. converter controls compared with described single through the 4th resistance
The first end connection of the first input end and the 4th resistance of member, the second output terminal of the A.C.-D.C. converter and institute
The second end for stating the 4th resistance is grounded.
Optionally, the comparison control circuit includes comparator, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance
And second driving switch, the inverting input terminal of the comparator are the first input end of the relatively control unit, the comparison
The non-inverting input terminal of device is connect with the common end of the 5th resistance and the 6th resistance, the output end of the comparator and described the
The first end of seven resistance connects；First the first DC power supply of termination of the 5th resistance, the second end warp of the 5th resistance
6th resistance eutral grounding；The second end of 7th resistance and the controlled end of second driving switch and the 8th resistance
First end interconnection；The second end of the input terminal of second driving switch and the 8th resistance is grounded, and described second drives
The output end and the PFC driving circuit of dynamic switch.
The present invention also proposes a kind of air conditioner, including pfc circuit as described above.
Pfc circuit of the present invention controls signal according to the PFC received by setting, PFC driving circuit, and output is corresponding
PFC driving signal to drive PFC switching circuit to work, and passes through the AC energy exported through reactor according to PFC driving signal
The access of first input/output terminal, then export to second input/output terminal, or the friendship that the second input/output terminal is accessed
Galvanic electricity source, which is exported, realizes that the waveform of the input current of pfc circuit follows input voltage to the first input/output terminal and reactor
Waveform, the carry out Active PFC to the AC power source of access.The present invention also passes through setting current foldback circuit, is detecting
When flowing through the electric current of the PFC switching circuit and reaching predetermined current threshold, controls the PFC driving circuit and stop output PFC and drive
Dynamic signal, and then control PFC switching circuit and stop working.It can solve opening in PFC switching circuit by current foldback circuit
Device is closed because of the impaired problem of overcurrent, improves the reliability of pfc circuit.In addition, the present invention no setting is required rectifier bridge, docking
Enter the carry out Active PFC of AC power source, so that the volume for solving bridge heap is larger, on-state loss is big, is easy to cause PFC
The loss of circuit is big, the low problem of efficiency.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the functional block diagram of one embodiment of pfc circuit of the present invention；
Fig. 2 is the electrical block diagram of another embodiment of pfc circuit of the present invention；
Fig. 3 is the electrical block diagram of the another embodiment of pfc circuit of the present invention；
Fig. 4 is the electrical block diagram of pfc circuit another embodiment of the present invention.
Drawing reference numeral explanation:
| Label | Title | Label | Title |
| 10 | Rectification circuit | U1 | First driving switch |
| 20 | PFC driving circuit | U2 | Signal isolation device |
| 30 | PFC switching circuit | U3 | Comparator |
| 40 | Current foldback circuit | U4 | Second driving switch |
| 50 | Energy storage filter circuit | R1~R8 | First resistor~the 8th resistance |
| 41 | Current detecting unit | T1 | Transformer |
| 42 | Compare control unit | Q1~Q4 | First switch tube~the 4th switching tube |
| 411 | A.C.-D.C. converter | D1~D4 | First diode~the 4th diode |
| L1 | Reactor |
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that if relating to directionality instruction (such as up, down, left, right, before and after ...) in the embodiment of the present invention,
Then directionality instruction be only used for explain under a certain particular pose (as shown in the picture) between each component relative positional relationship,
Motion conditions etc., if the particular pose changes, directionality instruction is also correspondingly changed correspondingly.
In addition, being somebody's turn to do " first ", " second " etc. if relating to the description of " first ", " second " etc. in the embodiment of the present invention
Description be used for description purposes only, be not understood to indicate or imply its relative importance or implicitly indicate indicated skill
The quantity of art feature." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one spy
Sign.It in addition, the technical solution between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
It is enough realize based on, will be understood that the knot of this technical solution when conflicting or cannot achieve when occurs in the combination of technical solution
Conjunction is not present, also not the present invention claims protection scope within.
The present invention proposes a kind of pfc circuit.
Referring to Fig.1, in an embodiment of the present invention, which includes:
One end of reactor L1, the reactor L1 and the zero line L connection of AC power source；
Rectification circuit 10, the input terminal of the rectification circuit 10 are connect with the other end of the reactor L1；
PFC driving circuit 20 exports corresponding PFC driving signal according to the control signal received；
The output end of PFC switching circuit 30, the controlled end of the PFC switching circuit 30 and the PFC driving circuit 20 connects
It connects, the first input/output terminal of the PFC switching circuit 30 is connect with the other end of the reactor L1；The PFC switch electricity
Second input/output terminal on road 30 is connect with the zero line side N of the AC power source；The PFC switching circuit 30, according to described
PFC driving signal exports the power supply that first input/output terminal accesses to second input/output terminal, or by institute
The power supply for stating the access of the second input/output terminal is exported to first input/output terminal；
Current foldback circuit 40, the second of the test side of the current foldback circuit 40 and the PFC switching circuit 30 are defeated
Enter/output end connection, the output end of the current foldback circuit 40 is connect with the PFC driving circuit 20；The overcurrent protection
Circuit 40 controls the PFC driving when detecting that the electric current for flowing through the PFC switching circuit 30 reaches predetermined current threshold
Circuit 20 stops output PFC driving signal.
In the present embodiment, reactor L1 and PFC switching circuit 30 constitute PFC main circuit, and PFC main circuit can be booster type
Perhaps voltage-dropping type pfc circuit or buck-boost type pfc circuit, the present embodiment are chosen as low-frequency active boost PFC to pfc circuit
Circuit.One end of reactor L1 and the zero line of ac input end connect, and one end is connect with rectification circuit 10, ac input end
Zero line is connect with the second input/output terminal of PFC switching circuit 30 respectively.Pfc circuit can be applied to Switching Power Supply, frequency conversion
In the circuit modules such as device, accordingly, pfc circuit be can be set on the electric-controlled plate of Switching Power Supply, or is set to and is provided with change
On the electric-controlled plate of frequency device.Master controller MCU is additionally provided on electric-controlled plate, master controller MCU can be control air-conditioner outdoor unit
The master controller MCU or master controller MCU of the devices such as middle compressor, blower work are the master for being exclusively used in pfc circuit control
Controller MCU, master controller MCU drive pfc circuit in the power frequency period of AC power source with low frequency, which can be with
For 1 time or it is a small number of several times.Control of the PFC driving circuit 20 based on outdoor unit master controller MCU in pfc circuit, according to outdoor
The PFC of owner's controller MCU output controls signal, exports corresponding PFC driving signal.The power supply of control chip on electric-controlled plate
Voltage is usually that the voltage of 3.3V perhaps PFC control signal of its output of 5V is also usually 3.3V or 5V, and in pfc circuit
Switching tube be usually arranged as relay perhaps power tube need 9V, 12V or higher driving voltage to go to drive, for this purpose, this
Embodiment, which passes through after the PFC received control signal is amplified processing by setting PFC driving circuit 20, to be exported to PFC switch electricity
Road 30.Specifically, master controller MCU can be the pulse PFC control signal of high and low level, in the pulse for receiving high level
When PFC controls signal, 20 output drive signal of PFC driving circuit, to drive PFC switching circuit 30 to open, and it is low receiving
When the pulse PFC of level controls signal, 20 output drive signal of PFC driving circuit, to drive PFC switching circuit 30 to turn off.Or
Person, when receiving low level pulse PFC control signal, 20 output drive signal of PFC driving circuit, to drive PFC to switch
Circuit 30 is opened, and when the pulse PFC for receiving high level controls signal, 20 output drive signal of PFC driving circuit, to drive
Dynamic PFC switching circuit 30 turns off.
PFC switching circuit 30 is in the case where unlatching, and in the positive half cycle of AC power source, AC power source is from ac input end
Firewire access exported to the first input/output terminal of PFC switching circuit 30, then open through PFC after reactor L1 energy storage
Second input/output terminal on powered-down road 30；And in the negative half period of AC power source, AC power source connects from the zero curve of ac input end
Enter to the second input/output terminal of PFC switching circuit 30, the first input/output terminal of PFC switching circuit 30, output to reactance
Device L1 is exported after reactor L1 energy storage to the firewire of ac input end.Alternatively, in the positive half cycle of AC power source, alternating current
From ac input end firewire access, after reactor L1 energy storage, export to PFC switching circuit 30 first input/it is defeated
Outlet, then the second input/output terminal through PFC switching circuit 30；And in the negative half period of AC power source, PFC switching circuit 30
In off state, and AC power source is exported through reactor L1 to rectification circuit 10.Alternatively, in the positive half cycle of AC power source
When, PFC switching circuit 30 is in off state；In the positive half cycle of AC power source, zero curve of the AC power source from ac input end
Access to the second input/output terminal of PFC switching circuit 30, the first input/output terminal of PFC switching circuit 30, output to electricity
Anti- device L1 is exported after reactor L1 energy storage to the firewire of ac input end.So set, rectifier bridge can be needed not move through, i.e.,
It can be achieved to advantageously reduce the power consumption of pfc circuit itself to the carry out Active PFC of the AC power source of access.
The diode that rectification circuit 10 can be sequentially connected in series using two realizes, can also be using four diodes come real
Existing, the present embodiment is illustrated for four, and four diodes are respectively labeled as D41, D42, D43, D44；Two diodes
After D41, D42 are arranged in series, then diode D43, D44 for being arranged in series with other two are arranged in parallel.Reactor L1 is connected to
The common end of two groups of diodes being arranged in series, the cathode connection DC bus of two groups of diode D41, D43 being arranged in parallel, two
The zero line side of the anode connection ac input end of pole pipe D42, D44.
In the present embodiment, current foldback circuit 40 is being examined for detecting the electric current for flowing through 30 switching circuit of PFC switching circuit
When measuring the electric current of PFC switching circuit 30 less than predetermined current threshold, current foldback circuit 40 is failure to actuate, and is flowed through detecting
When the electric current of the PFC switching circuit 30 reaches predetermined current threshold, controls the PFC driving circuit 20 and stop output PFC drive
Dynamic signal, and then control PFC switching circuit 30 and stop working.So set, PFC switching circuit 30 can flowed through more than threshold value
When, avoid the switching device in PFC switching circuit 30 from being damaged.
Pfc circuit of the present invention controls signal according to the PFC received by setting, PFC driving circuit 20, and output phase is answered
PFC driving signal, to drive PFC switching circuit 30 to work, and the exchange that will be exported through reactor L1 according to PFC driving signal
Electric energy is accessed through the first input/output terminal, then is exported to second input/output terminal, or the second input/output is terminated
The AC power source entered exports that realize that the waveform of the input current of pfc circuit is followed to the first input/output terminal and reactor L1 defeated
The waveform for entering voltage, the carry out Active PFC to the AC power source of access.The present invention also passes through setting current foldback circuit
40, when detecting that the electric current for flowing through the PFC switching circuit 30 reaches predetermined current threshold, control the PFC driving circuit
20 stop output PFC driving signal, and then control PFC switching circuit 30 and stop working.It can be solved by current foldback circuit 40
Certainly the switching device in PFC switching circuit 30 improves the reliability of pfc circuit because of the impaired problem of overcurrent.In addition, this hair
Bright no setting is required rectifier bridge, the carry out Active PFC to access AC power source are led to so that the volume for solving bridge heap is larger
State loss is big, is easy to cause the loss of pfc circuit big, the low problem of efficiency.
Referring to Fig. 2 to 4, in one embodiment, the PFC driving circuit 20 includes the first driving switch U1, first resistor
The first end of R1, second resistance R2 and signal isolation device U2, the first resistor R1 are the controlled of the PFC driving circuit 20
End, the second end of the first resistor R1 and the controlled end of the first driving switch U1 and the first end of the second resistance R2
Interconnection；The input terminal of the first driving switch U1 and the second end of the second resistance R2 and the first DC power supply VCC1 connect
It connects, the output end of the first driving switch U1 is connect with the input terminal of the signal isolation device U2, the signal isolator
The output end of part U2 is the output end of the PFC driving circuit 20.
In the present embodiment, the first driving switch U1 can be realized using the switching tube of triode, metal-oxide-semiconductor, the present embodiment
First driving switch U1 realizes that signal isolation device U2 can use optocoupler, diode, relay, biography using PNP triode
The element of signal isolation may be implemented to realize in sensor etc., and the present embodiment is chosen as optocoupler, wherein the collector of PNP triode
It is connect with the anode of luminous coupling light emitting diode.The collector of optocoupler phototriode is connect with the second DC power supply VCC2, hair
Emitter-base bandgap grading is then connect with the controlled end of PFC switching circuit 30, and optocoupler is also that PFC switching circuit 30 provides driving power.Certainly at it
He realize in, the first driving switch U1 can also be realized using NPN triode, NPN triode then with luminous coupling light-emitting diodes
The cathode of pipe connects.The element and connection relationship of PFC driving circuit 20 can carry out adaptability change according to specific scheme, this
Place is with no restrictions.PNP triode conducting when receiving low level PFC control signal, so that optocoupler be driven to be connected, and exports
Corresponding driving signal is to PFC switching circuit 30.PNP triode cut-off when the PFC for receiving high level controls signal, thus
Optocoupler cut-off is driven, and then stops exporting corresponding driving signal to PFC switching circuit 30.
Referring to Fig. 2, in one embodiment, the PFC switching circuit 30 includes first switch tube Q1 and first diode D1,
The controlled end of the first switch tube Q1 is the controlled end of the PFC switching circuit 30, the input terminal of the first switch tube Q1
For the first input/output terminal of the PFC switching circuit 30, the output end of the first switch tube Q1 and the first diode
The anode of D1 connects, and the cathode of the first diode D1 is the second input/output terminal of the PFC switching circuit 30.This reality
It applies in example, PFC switching circuit 30 further includes resistance R21, resistance R22, and resistance R21 is arranged in series in the defeated of PFC driving circuit 20
Between outlet and the controlled end of first switch tube Q1；Resistance R22 is arranged in series controlled end and input terminal in first switch tube Q1
Between.Wherein, resistance R21 is current-limiting resistance, and resistance R22 is biasing resistor.
Further, in above-described embodiment, the first switch tube Q1 is metal-oxide-semiconductor or IGBT.
In the present embodiment, when the PFC for receiving master controller MCU output controls signal, the driving control of PFC switching circuit 30
Metal-oxide-semiconductor or IGBT conducting in major loop processed, the first diode D1 of series connection with it also exchange conducting in positive half period
The voltage of the firewire of input terminal is positive relative to the voltage of zero curve, and the path of main circuit current is firewire-electricity of ac input end
The zero curve of anti-device L1- (fuse FUSE1)-IGBT device (or metal-oxide-semiconductor) Q1- first diode D1- ac input end；Just
In half period, the voltage of the zero curve of ac input end is positive relative to the voltage of firewire, no matter metal-oxide-semiconductor or IGBT conducting whether
Open-minded, first diode D1 does not work all in off state, pfc circuit.First exported by adjusting PFC driving circuit 20
Pulse width, pulse frequency of switching tube Q1 etc., and then the turn-on time of first switch tube Q1 is controlled, turn-on frequency etc. is realized
Carry out Active PFC to the AC power source of access.
Referring to Fig. 3, in one embodiment, the PFC switching circuit 30 includes second switch Q2 and the second diode D2,
The controlled end of the second switch Q2 is the controlled end of the PFC switching circuit 30, and the anode of the second diode D2 is
First input/output terminal of the PFC switching circuit 30, the cathode of the second diode D2 is with the second switch Q2's
Input terminal connection；The output end of the second switch Q2 is the second input/output terminal of the PFC switching circuit 30.This reality
It applies in example, PFC switching circuit 30 further includes resistance R23, resistance R24, and resistance R23 is arranged in series in the defeated of PFC driving circuit 20
Between outlet and the controlled end of second switch Q2；Resistance R24 is arranged in series controlled end and input terminal in second switch Q2
Between.Wherein, resistance R23 is current-limiting resistance, and resistance R24 is biasing resistor.
Further, the second switch Q2 is metal-oxide-semiconductor or IGBT.
In the present embodiment, when the PFC for receiving master controller MCU output controls signal, the driving control of PFC switching circuit 30
Metal-oxide-semiconductor or IGBT conducting in major loop processed, the second diode D2 of series connection with it also exchange conducting in negative half-cycle
The voltage of the zero curve of input terminal is positive relative to the voltage of firewire, and the path of main circuit current is the zero curve-of ac input end
The firewire of IGBT device (or metal-oxide-semiconductor) Q1- the second diode D2- reactor L1- (fuse FUSE1)-ac input end；In
In positive half period, the voltage of the firewire of ac input end is positive relative to the voltage of zero curve, no matter metal-oxide-semiconductor or IGBT conducting be
No open-minded, all in off state, pfc circuit does not work the second diode D2.The exported by adjusting PFC driving circuit 20
Pulse width, the pulse frequency etc. of two switching tube Q2, and then the turn-on time of second switch Q2 is controlled, turn-on frequency etc. is real
Now to the carry out Active PFC of the AC power source of access.
Referring to Fig. 4, in one embodiment, the PFC switching circuit 30 includes third switching tube Q3 and the 4th switching tube Q4,
The controlled end and the 4th switching tube Q4 of the third switching tube Q3 is connect with the output end of the PFC driving circuit 20, institute
The first conducting end for stating third switching tube Q3 is the first input/output terminal of the PFC switching circuit 30, the third switching tube
The second conducting end of Q3 is connect with the first conducting end of the 4th switching tube Q4, the second conducting end of the 4th switching tube Q4
For the second input/output terminal of the PFC switching circuit 30.
In the present embodiment, third switching tube Q3 and the 4th switching tube Q4 are optional using metal-oxide-semiconductor or IGBT.It is switched in third
Pipe Q3 and the 4th switching tube Q4 is using IGBT come when realizing, third switching tube Q3 and the 4th switching tube Q4 are oppositely arranged, Ye Ji
The emitter of three switching tube Q3 and the emitter of the 4th switching tube Q4 are connected.In the present embodiment, PFC switching circuit 30 further includes
Resistance R25, resistance R26, resistance R27, resistance R28, resistance R25 are arranged in series output end and third in PFC driving circuit 20
Between the controlled end of switching tube Q3；Resistance R24 is arranged in series between the controlled end and input terminal of third switching tube Q3；Resistance
R27 is arranged in series between the output end of PFC driving circuit 20 and the controlled end of the 4th switching tube Q4；Resistance R28 is arranged in series
Between the controlled end and input terminal of the 4th switching tube Q4.Wherein, resistance R25, R27 is current-limiting resistance, and resistance R26, R28 are inclined
Set resistance.
The PFC switching circuit 30 further includes third diode D3 and the 4th diode D4, the third diode D3's
Anode is connect with the first conducting end of the 4th diode D4, and the cathode and the reactor L1 of the third diode D3 connects
It connects；The anode of the 4th diode D4 is connect with the second conducting end of the third switching tube Q3, the 4th diode D4
Cathode and AC power source zero line L connection.Third diode D3 and third switching tube Q3 reverse parallel connection are arranged, the four or two pole
Pipe D4 and the 4th switching tube Q4 reverse parallel connection are arranged.
In third switching tube Q3 and the 4th switching tube Q4 using IGBT to realize when, when receive master controller MCU output
PFC when controlling signal, the IGBT conducting in 30 drive control major loop of PFC switching circuit in PFC switching circuit 30, namely drive
Dynamic third switching tube Q3 and the 4th switching tube Q4 conducting.In positive half period, the voltage of the firewire of ac input end is relative to zero
The voltage of line is positive, and the corresponding IGBT of the 4th switching tube Q4 is in off state at this time, the 4th diode with its reverse parallel connection
D4 conducting, the path of main circuit current are firewire-reactor L1- (fuse FUSE1)-third switching tube of ac input end
The firewire of the 4th diode D4- ac input end of Q3-；In negative half-cycle, the voltage of the zero curve of ac input end is relative to fire
The voltage of line is positive, and the corresponding IGBT of third switching tube Q3 is in off state at this time, the third diode with its reverse parallel connection
The path that main circuit current is connected in D3 is the four switching tube Q4- third diode D3- reactor L1- of zero curve-the of ac input end
The firewire of (fuse FUSE1)-ac input end.The third switching tube Q3 and the 4th exported by adjusting PFC driving circuit 20
Pulse width, pulse frequency of switching tube Q4 etc., and then the turn-on time of third switching tube Q3 and the 4th switching tube Q4 are controlled, it leads
Passband rate etc. realizes the carry out Active PFC to the AC power source of access.
Referring to Fig. 2, in one embodiment, the current foldback circuit 40 is including current detecting unit 41 and compares control list
Member 42, the test side of the current detecting unit 41 are the test side of the current foldback circuit 40, the current detecting unit
The first input end of 41 output end control unit 42 compared with described connects, the second input terminal of the relatively control unit 42
Reference current signal is accessed, the output end of the relatively control unit 42 is the output end of the current foldback circuit 40；Wherein,
The current detecting unit 41, after the AC current signal for will test is converted to the DC current flow signal of corresponding size
Output, the relatively control unit 42, for controlling institute when the DC current flow signal is greater than the reference current signal
It states PFC driving circuit 20 and stops output PFC driving signal.
In the present embodiment, current detecting unit 41 is isolated form current detection circuit, passes through isolated form current detection circuit
It may be implemented to flow through the current detecting of PFC switching circuit 30, while can also realize the input and output isolation of current detection signal.
It is understood that in the present embodiment current detecting unit 41 detect be ac current signal, current detecting unit 41 may be used also
It is exported after being converted to the DC current flow signal of corresponding size with the AC current signal for will test, compares control unit
42 are compared the DC current flow signal of access with reference current signal, are greater than the reference in DC current flow signal
When current signal, then it represents that the electric current for flowing through the PFC switching circuit 30 at this time reaches predetermined current threshold, and then described in control
PFC driving circuit 20 stops output PFC driving signal.
Referring to Fig. 2, in one embodiment, the current detecting unit 41 includes transformer T1, A.C.-D.C. converter
411,3rd resistor R3 and the 4th resistance R4, one end of the primary coil of the transformer T1 and the PFC switching circuit 30
The connection of second input/output terminal, the other end ground connection of the primary coil of the transformer T1；The transformer T1 secondary coil
Both ends and two input terminals of the A.C.-D.C. converter 411 connect one to one；The A.C.-D.C. converter 411
First the output end first input end of control unit 42 and the 4th resistance R4 compared with described through the 4th resistance R4
First end connection, the second output terminal of the A.C.-D.C. converter 411 and the second end of the 4th resistance R4 are grounded.
In the present embodiment, transformer T1 is used to acquire the ac current signal of primary coil, and is coupled to secondary coil
The variation for accessing the ac current signal of negative and positive is positive by A.C.-D.C. converter 411, A.C.-D.C. converter 411
The DC current signal of phase, 3rd resistor R3 and the 4th resistance R4 series connection partial pressure, it is defeated after DC current signal is divided
Out to the first input end of comparison control circuit, predetermined current threshold can be by adjusting 3rd resistor R3 and the 4th resistance R4 points
Pressure ratio is configured, and can specifically be realized by adjusting the resistance of 3rd resistor R3 and the 4th resistance R4, comparison control circuit
When detecting that the electric current for flowing through the PFC switching circuit 30 reaches predetermined current threshold, control the PFC driving circuit 20
Stop output PFC driving signal, and then so that PFC driving circuit 20 is controlled PFC switch and stop working.
Referring to Fig. 2, in one embodiment, the comparison control circuit includes comparator U3, the 5th resistance R5, the 6th resistance
R6, the 7th resistance R7, the 8th resistance R8 and the second driving switch U4, the inverting input terminal of the comparator U3 are the relatively control
The first input end of unit 42 processed, the public affairs of the non-inverting input terminal of the comparator U3 and the 5th resistance R5 and the 6th resistance R6
End connection, the output end of the comparator U3 are connect with the first end of the 7th resistance R7 altogether；The of the 5th resistance R5
One the first DC power supply VCC1 of termination, the second end of the 5th resistance R5 are grounded through the 6th resistance R6；7th electricity
The first end for hindering the second end of R7 and the controlled end of the second driving switch U4 and the 8th resistance R8 interconnects；Described second
The second end of the input terminal of driving switch U4 and the 8th resistance R8 are grounded, the output end of the second driving switch U4 with
The PFC driving circuit 20.
In the present embodiment, the second driving switch U4 is optional to be realized using electronic switches such as triode, metal-oxide-semiconductors, and second drives
Dynamic switch U4 is high level triggering and conducting, the electronic switch of low level triggering shutdown.The non-inverting input terminal of comparator U3 accesses ginseng
Current signal is examined, inverting input terminal receives the current signal namely current detecting for flowing through the PFC switching circuit 30 detected
Signal, when current detection signal is less than reference current signal, comparator U3 exports the control signal of high level, and then makes second
Driving switch U4 is opened, thus make optocoupler, diode, relay, sensor etc. that the element manipulation of signal isolation may be implemented, and
When current detection signal is more than or equal to reference current signal, comparator U3 exports low level control signal, with control
Second driving switch U4 is disconnected, so that optocoupler, diode, relay, sensor etc. be made to stop working, and is stopped output PFC and is opened
Close driving signal.Output is to comparing after 5th resistance R5, the 6th resistance R6 are divided the first DC power supply VCC1 of access
The non-inverting input terminal of device adjusts the 5th resistance R5, the 6th to provide reference voltage namely reference current signal for comparator
The adjusting of reference current letter can be realized in resistance R6.
Referring to Fig. 2 or Fig. 4, in one embodiment, the pfc circuit further includes energy storage filter circuit 50, the energy storage filter
The input terminal of wave circuit 50 is connect with the output end of the rectification circuit 10.
In the present embodiment, energy storage filter circuit 50 is used to carry out the electric energy of output to store and filter the voltage of output
Wave, to stabilize the output voltage.Energy storage filter circuit 50 can use capacitor (C1, C2) Lai Shixian, specifically can be using two strings
Join the capacitor of setting to realize, when using two capacitor (C1, C2) Lai Shixian, two capacitors (C1, C2) are arranged in series in whole
Between two output ends of current circuit 10, the zero curve of ac input end is connect with the common end of two capacitors (C1, C2), thus with
Rectification circuit 10 realizes voltage multiplying rectifier.Namely the voltage value of the output end of rectification circuit 10 is equivalent to 10 input terminal of rectification circuit
Twice.
The present invention also proposes a kind of air conditioner, including pfc circuit as described above.The detailed construction of the pfc circuit can join
According to above-described embodiment, details are not described herein again；It is understood that due to having used above-mentioned pfc circuit in the air condition of that present invention,
Therefore, the embodiment of the air condition of that present invention includes whole technical solutions of above-mentioned pfc circuit whole embodiments, and skill achieved
Art effect is also identical, and details are not described herein.
The foregoing is merely alternative embodiments of the invention, are not intended to limit the scope of the invention, all at this
Under the inventive concept of invention, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/use indirectly
It is included in other related technical areas in scope of patent protection of the invention.
Claims (10)
1. a kind of pfc circuit, which is characterized in that the pfc circuit includes:
Reactor, one end of the reactor and the zero line of AC power source connect；
Rectification circuit, the input terminal of the rectification circuit are connect with the other end of the reactor；
PFC driving circuit exports corresponding PFC driving signal according to the control signal received；
PFC switching circuit, the controlled end of the PFC switching circuit are connect with the output end of the PFC driving circuit, the PFC
First input/output terminal of switching circuit is connect with the other end of the reactor；Second input of the PFC switching circuit/
Output end is connect with the zero line side of the AC power source；The PFC switching circuit, according to the PFC driving signal by described
The power supply of one input/output terminal access is exported to second input/output terminal, or second input/output is terminated
The power supply entered is exported to first input/output terminal；
Second input/output terminal of current foldback circuit, the test side of the current foldback circuit and the PFC switching circuit connects
It connects, the output end of the current foldback circuit is connect with the PFC driving circuit；The current foldback circuit is detecting stream
When electric current through the PFC switching circuit reaches predetermined current threshold, controls the PFC driving circuit and stop output PFC driving
Signal.
2. pfc circuit as described in claim 1, which is characterized in that the PFC driving circuit includes the first driving switch, the
One resistance, second resistance and signal isolation device, the first end of the first resistor are the controlled end of the PFC driving circuit,
The first end of the controlled end and the second resistance of the second end of the first resistor and first driving switch interconnects；It is described
The second end of the input terminal of first driving switch and the second resistance is connect with the first DC power supply, first driving switch
Output end connect with the input terminal of the signal isolation device, the output end of the signal isolation device is PFC driving
The output end of circuit.
3. pfc circuit as described in claim 1, which is characterized in that the PFC switching circuit includes first switch tube and first
Diode, the controlled end of the first switch tube are the controlled end of the FC switching circuit, the input terminal of the first switch tube
For the first input/output terminal of the PFC switching circuit, the sun of the output end of the first switch tube and the first diode
Pole connection, the cathode of the first diode are the second input/output terminal of the PFC switching circuit.
4. pfc circuit as described in claim 1, which is characterized in that the PFC switching circuit includes second switch and second
Diode, the controlled end of the second switch are the controlled end of the FC switching circuit, and the anode of second diode is
First input/output terminal of the PFC switching circuit, the cathode of second diode and the input terminal of the second switch
Connection；The output end of the second switch is the second input/output terminal of the PFC switching circuit.
5. pfc circuit as described in claim 1, which is characterized in that the PFC switching circuit includes third switching tube and the 4th
The output of the controlled end and the PFC driving circuit of switching tube, the controlled end of the third switching tube and the 4th switching tube
End connection, the first conducting end of the third switching tube are the first input/output terminal of the PFC switching circuit, the third
Second conducting end of switching tube is connect with the first conducting end of the 4th switching tube, the second conducting end of the 4th switching tube
For the second input/output terminal of the PFC switching circuit.
6. pfc circuit as claimed in claim 5, which is characterized in that the PFC switching circuit further includes third diode and
Four diodes, the anode of the third diode are connect with the first conducting end of the 4th switching tube, the third diode
Cathode connect with the reactor；The anode of 4th diode is connect with the second conducting end of the third switching tube,
The cathode of 4th diode and the zero line of AC power source connect.
7. the pfc circuit as described in claim 1 to 6 any one, which is characterized in that the current foldback circuit includes electric current
Detection unit and compare control unit, the test side of the current detecting unit is the test side of the current foldback circuit, institute
State the first input end connection of output end control unit compared with described of current detecting unit, the of the relatively control unit
Two input terminals access reference current signal, and the output end of the relatively control unit is the output end of the current foldback circuit；
Wherein, the current detecting unit, the AC current signal for will test are converted to the DC current flow letter of corresponding size
It is exported after number, the relatively control unit, for controlling when the DC current flow signal is greater than the reference current signal
The PFC driving circuit stops output PFC driving signal.
8. pfc circuit as claimed in claim 7, which is characterized in that the current detecting unit includes transformer, exchange-straight
The second of current converter, 3rd resistor and the 4th resistance, one end of the primary coil of the transformer and the PFC switching circuit
Input/output terminal connection, the other end ground connection of the primary coil of the transformer；The both ends of the secondary transformer and institute
Two input terminals for stating A.C.-D.C. converter connect one to one；First output end of the A.C.-D.C. converter is through institute
It states the 4th resistance first end of the first input end of control unit and the 4th resistance compared with described to connect, the exchange-
The second output terminal of DC converter and the second end of the 4th resistance are grounded.
9. pfc circuit as claimed in claim 7, which is characterized in that the comparison control circuit includes comparator, the 5th electricity
Resistance, the 6th resistance, the 7th resistance, the 8th resistance and the second driving switch, the inverting input terminal of the comparator are the comparison
The common end of the first input end of control unit, the non-inverting input terminal of the comparator and the 5th resistance and the 6th resistance connects
It connects, the output end of the comparator is connect with the first end of the 7th resistance；First termination first of the 5th resistance is straight
Galvanic electricity source, the second end of the 5th resistance is through the 6th resistance eutral grounding；The second end and described second of 7th resistance
The interconnection of the first end of the controlled end of driving switch and the 8th resistance；The input terminal of second driving switch and the described 8th
The second end of resistance is grounded, the output end of second driving switch and the PFC driving circuit.
10. a kind of air conditioner, which is characterized in that including pfc circuit as claimed in any one of claims 1 to 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910618776.2A CN110417251B (en) | 2019-07-09 | 2019-07-09 | PFC circuit and air conditioner |
| PCT/CN2020/100625 WO2021004451A1 (en) | 2019-07-09 | 2020-07-07 | Pfc circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910618776.2A CN110417251B (en) | 2019-07-09 | 2019-07-09 | PFC circuit and air conditioner |
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| CN110417251A true CN110417251A (en) | 2019-11-05 |
| CN110417251B CN110417251B (en) | 2021-08-13 |
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| WO (1) | WO2021004451A1 (en) |
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| CN112701903B (en) * | 2021-01-22 | 2022-03-18 | Oppo广东移动通信有限公司 | Control circuit, switching power supply and electronic equipment |
| CN114498545A (en) * | 2021-12-27 | 2022-05-13 | 珠海格力电器股份有限公司 | Overcurrent failure protection circuit and electronic equipment |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN110417251B (en) | 2021-08-13 |
| WO2021004451A1 (en) | 2021-01-14 |
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