CN108809075A - Totem pfc circuit, pulse width control method, air conditioner and storage medium - Google Patents
Totem pfc circuit, pulse width control method, air conditioner and storage medium Download PDFInfo
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- CN108809075A CN108809075A CN201810560782.2A CN201810560782A CN108809075A CN 108809075 A CN108809075 A CN 108809075A CN 201810560782 A CN201810560782 A CN 201810560782A CN 108809075 A CN108809075 A CN 108809075A
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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
- H02M1/4233—Arrangements for improving power factor of AC input using a bridge converter comprising active switches
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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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Abstract
The invention discloses a kind of totem pfc circuits, including：Bridge circuit, reactor, bus capacitor, sampling resistor and control module, the control module is used for when the electric current of the sampling resistor is less than or equal to predetermined current threshold, according to the input voltage and input current of the bridge circuit input terminal, the pulsewidth when on off state of each switch unit and each switching means conductive is controlled.The invention also discloses a kind of pulse width control method, air conditioner and storage mediums.The present invention realizes while reducing each switch unit on-off times, it is that each switch unit selects suitable pulsewidth according to input voltage and input current, it can be under the premise of meeting the current harmonics requirement of totem pfc circuit, improving the power factor of totem pfc circuit, reduce on-off times, to reduce the number of short circuit current flow, and then reduce switching loss while idle work power in reducing circuit, improve the efficiency of totem pfc circuit.
Description
Technical field
The present invention relates to air-conditioning technical field more particularly to a kind of totem pfc circuit, pulse width control method, air conditioners
And storage medium.
Background technology
With the development of power electronic technique, active PFC (Power Factor Correction, PFC)
The advantages that technology is high, harmonic current is small, output voltage stabilization with power factor is widely used.
Currently, the PFC of BOOST types is generally used, this PFC simple structure, convenient controls, but efficiency is more low
Under.Therefore, at some to the higher occasion of efficiency requirements, using no bridge totem pfc circuit, this circuit reduce on circuit
Number of devices, improve efficiency.
It is single in the scheduled switch of the control once for every half ON/OFF of supply voltage in existing totem pfc circuit
The number of member controls the number of totem pfc circuit short circuit currents, improves power factor by the short circuit current.But when
When loading bigger, short circuit current flow number is less to make the improvement of power factor insufficient, lead to totem pfc circuit
The power of middle idle work is larger；And if the number of short circuit current flow is more, cause switching losses to become larger；Cause totem
Column pfc circuit it is less efficient.
The above is only used to facilitate the understanding of the technical scheme, and is not represented and is recognized that the above is existing skill
Art.
Invention content
The main purpose of the present invention is to provide a kind of totem pfc circuit, pulse width control method, air conditioner and storages to be situated between
Matter, it is intended to solve the less efficient technical problem of existing totem pfc circuit.
To achieve the above object, the present invention provides a kind of totem pfc circuit, and the totem pfc circuit includes：
Bridge circuit, the bridge circuit are equipped with the multiple switch unit for being connected as bridge shape, the bridge circuit
Input terminal is connected with AC power, and output end is connected with load；
Reactor, the reactor are arranged between the bridge circuit and the AC power；
Bus capacitor is electrically connected after the bus capacitor is in parallel with the load with the output end of the bridge circuit；
Sampling resistor, the sampling resistor are arranged between the output end and the bus capacitor of the bridge circuit；
Control module, the control module are used for when the electric current of the sampling resistor is more than predetermined current threshold, control
Each switch unit shutdown in the bridge circuit；And it is less than or equal to predetermined current threshold in the electric current of the sampling resistor
When, according to the input voltage and input current of the bridge circuit input terminal, control each switch unit on off state and
Pulsewidth when each switching means conductive.
In one embodiment, the bridge circuit include first switch unit, second switch unit, third switch unit and
4th switch unit；
The first switch unit is connected in series to form the first branch with the second switch unit, and the third switch is single
First to be connected in series to form the second branch with the 4th switch unit, the first branch is connected in parallel to form institute with the second branch
State bridge circuit；
The tie point of the first switch unit and the second switch unit is via the reactor and the alternating current
Source is electrically connected；The third switch unit is electrically connected with the tie point of the 4th switch unit with the AC power；
The first switch unit is electrically connected with the tie point of the third switch unit with the anode of the bus capacitor；
The second switch unit is electrically connected with the tie point of the 4th switch unit with the cathode of the bus capacitor.
In one embodiment, the control module includes：
Current detecting unit, the current detecting unit is electrically connected with the input terminal of the bridge circuit, for detecting
State the input current of the input terminal of bridge circuit；
Alternating voltage detection unit, the alternating voltage detection unit are electrically connected with the input terminal of the bridge circuit, are used
In the input voltage of the input terminal of detection bridge circuit；
Control unit, described control unit are electrically connected with the current detecting unit and the alternating voltage detection unit respectively
It connects, for when the electric current of the sampling resistor is less than or equal to predetermined current threshold, being detected according to the current detecting unit
To the input voltage that detects of input current and the alternating voltage detection unit, control each in the bridge circuit open
Close the pulsewidth when on off state of unit and each switching means conductive.
In one embodiment, the control module further includes：Drive protection location and driving unit；
The driving protection location is electrically connected with the sampling resistor and the driving unit respectively, described for acquiring
The electric current of sampling resistor, and when the electric current of the sampling resistor is more than predetermined current threshold, shutdown control signal is sent to institute
State driving unit；
The driving unit is used to control each switch in the bridge circuit according to the shutdown control signal received single
Member shutdown；
Described control unit is additionally operable to when the electric current of the sampling resistor is less than or equal to predetermined current threshold, according to institute
It states the input current that current detecting unit detects and the input voltage that the alternating voltage detection unit detects generates state
Signal is controlled, and the state control signal is sent to the driving unit；
The driving unit is additionally operable to control each switch in the bridge circuit according to the state control signal received
The pulsewidth when on off state of unit and each switching means conductive.
In addition, to achieve the above object, the present invention also provides a kind of pulse width control methods, are applied to above-mentioned totem
Pfc circuit, the pulse width control method include the following steps：
When the electric current of sampling resistor is less than or equal to predetermined current threshold, the input voltage of bridge circuit input terminal is determined
It currently whether there is positive and negative switching；
In the input voltage, there is currently when positive and negative switching, determine whether the input voltage of input terminal after positive and negative switching is located
In positive half period；
When the input voltage of input terminal is in positive half period after positive and negative switching, the first switch unit, second are controlled
Switch unit and the shutdown of third switch unit, when controlling the 4th switching means conductive, and being based on pulse change number, pulse
Between be spaced and the input current of the input terminal, control second switch unit, first switch units alternately ground ON/OFF,
And pulsewidth when second switch unit conducting；
When the input voltage of input terminal is in negative half-cycle after positive and negative switching, the first switch unit, second are controlled
Switch unit and the shutdown of the 4th switch unit, when controlling the third switching means conductive, and being based on pulse change number, pulse
Between be spaced and the input current of the input terminal, control first switch unit, second switch units alternately ground ON/OFF,
And pulsewidth when first switch unit conducting.
In one embodiment, the pulse change number be 3 times, the pulse interval include the first preset duration,
Second preset duration and third preset duration；It is described based on pulse change number, pulse interval and the input terminal
Input current, ON/OFF and the second switch unit are led with controlling second switch unit, first switch units alternately
The step of pulsewidth when logical includes：
The first input current based on the input terminal in the first preset duration calculates the first pulsewidth；
When the conducting duration of the 4th switch unit reaches first preset duration, in the first pulsewidth internal control
Make the second switch unit conducting；
When the conducting duration of the second switch unit reaches first pulsewidth, in the second preset duration internal control
The first switch unit conducting, second switch unit shutdown are made, and based on the input in second preset duration
Second input current at end calculates the second pulsewidth；
When the conducting duration of the first switch unit reaches second preset duration, in the second pulsewidth internal control
Make the second switch unit conducting, first switch unit shutdown；
When the conducting duration of the second switch unit reaches second pulsewidth, in the third preset duration internal control
The first switch unit conducting, second switch unit shutdown are made, and based on the input in the third preset duration
The third input current at end calculates third pulsewidth；
When the conducting duration of the first switch unit reaches the third preset duration, in the third pulsewidth internal control
Make the second switch unit conducting, first switch unit shutdown；
When the conducting duration of the second switch unit reaches the third pulsewidth, controls the first switch unit and lead
Logical, the described second switch unit shutdown.
In one embodiment, first input current based on the input terminal in the first preset duration calculates the first arteries and veins
Wide step includes：
Obtain the corresponding default maximum pulse width of first pulsewidth and corresponding first predetermined current, default minimum pulse width and
Corresponding second predetermined current, and preset based on the default maximum pulse width, the first predetermined current, default minimum pulse width, second
Electric current and first input current calculate first pulsewidth according to linear interpolation algorithm.
In one embodiment, when the conducting duration in the second switch unit reaches the third pulsewidth, control
After the step of first switch unit conducting, second switch unit shutdown, further include：
When detecting that the current input current of the input terminal reaches 0, the first switch unit shutdown is controlled.
In one embodiment, the input electricity based on pulse change number, pulse interval and the input terminal
Stream, when ON/OFF and the first switch unit are connected with controlling first switch unit, second switch units alternately
The step of pulsewidth includes：
The 4th input current based on the input terminal in the first preset duration calculates the 4th pulsewidth；
When the conducting duration of the 4th switch unit reaches first preset duration, in the 4th pulsewidth internal control
Make the first switch unit conducting；
When the conducting duration of the first switch unit reaches four pulsewidth, in the second preset duration internal control
The second switch unit conducting, first switch unit shutdown are made, and based on the input in second preset duration
5th input current at end calculates the 5th pulsewidth；
When the conducting duration of the second switch unit reaches five preset duration, in the 5th pulsewidth internal control
Make the first switch unit conducting, second switch unit shutdown；
When the conducting duration of the first switch unit reaches five pulsewidth, in the third preset duration internal control
The second switch unit conducting, first switch unit shutdown are made, and based on the input in the third preset duration
6th input current at end calculates the 6th pulsewidth；
When the conducting duration of the second switch unit reaches the third preset duration, in the 6th pulsewidth internal control
Make the first switch unit conducting, second switch unit shutdown；
When the conducting duration of the first switch unit reaches six pulsewidth, controls the second switch unit and lead
Logical, the described first switch unit shutdown.
In one embodiment, when the conducting duration in the first switch unit reaches six pulsewidth, control
After the step of second switch unit conducting, first switch unit shutdown, further include：
When detecting that the current input current of the input terminal reaches 0, the second switch unit shutdown is controlled.
In one embodiment, the pulse width control method further includes：
When the electric current of the sampling resistor is more than predetermined current threshold, the first switch unit, second are controlled respectively
Switch unit, third switch unit and the 4th switch unit shutdown.
In addition, to achieve the above object, the present invention also provides a kind of air conditioner, the air conditioner includes：Above-mentioned totem
Column pfc circuit, memory, processor and it is stored in the pulse-width controlled journey that can be run on the memory and on the processor
The step of sequence, the pulse-width controlled program realizes pulse width control method described in any one of the above embodiments when being executed by the processor.
In addition, to achieve the above object, the present invention also provides a kind of storage medium, pulsewidth is stored on the storage medium
Program is controlled, the pulse-width controlled program realizes the step of pulse width control method described in any one of the above embodiments when being executed by processor
Suddenly.
When the present invention is less than or equal to predetermined current threshold by the electric current in sampling resistor R, control module is according to electric bridge
The input voltage and input current of circuit input end control the on off state of each switch unit and each switching means conductive
When pulsewidth, realize while reducing each switch unit on-off times, be each according to input voltage and input current
Switch unit selects suitable pulsewidth, can be electric in the current harmonics requirement, improvement totem PFC for meeting totem pfc circuit
Under the premise of the power factor on road, on-off times are reduced, to reduce the number of short circuit current flow, and then the nothing in reducing circuit
Reduce switching loss while diligent power, improves the efficiency of totem pfc circuit.
Description of the drawings
Fig. 1 is the structural schematic diagram of air conditioner in the hardware running environment that the embodiment of the present invention is related to；
Fig. 2 is the electrical block diagram of one embodiment of totem pfc circuit of the present invention；
Fig. 3 is the flow diagram of pulse width control method first embodiment of the present invention；
Fig. 4 be pulse width control method second embodiment of the present invention in be based on pulse change number, pulse interval and
The input current of the input terminal, control second switch unit, first switch units alternately ground ON/OFF and described the
The refinement flow diagram of the step of pulsewidth when two switching means conductives；
Fig. 5 is the driving pulse of AC supply voltage Vs, circuital current Is and switch unit Q1~Q4 in the present invention
The schematic diagram of time change；
Fig. 6 be pulse width control method 3rd embodiment of the present invention in be based on pulse change number, pulse interval and
The input current of the input terminal, control first switch unit, second switch units alternately ground ON/OFF and described the
The refinement flow diagram of the step of pulsewidth when one switching means conductive.
Drawing reference numeral explanation：
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 implementation mode
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
As shown in Figure 1, in the hardware running environment that Fig. 1, which is the embodiment of the present invention, to be related to air conditioner structural representation
Figure.
As shown in Figure 1, the air conditioner may include：Processor 1001, such as CPU, network interface 1004, user interface
1003, memory 1005, communication bus 1002.Wherein, communication bus 1002 is for realizing the connection communication between these components.
User interface 1003 may include display screen (DIsplay), input unit such as keyboard (Keyboard), optional user interface
1003 can also include standard wireline interface and wireless interface.Network interface 1004 may include optionally that the wired of standard connects
Mouth, wireless interface (such as WI-FI interfaces).Memory 1005 can be high-speed RAM memory, can also be stable memory
(non-volatile memory), such as magnetic disk storage.Memory 1005 optionally can also be independently of aforementioned processor
1001 storage device.
Optionally, air conditioner can also include camera, RF (Radio Frequency, radio frequency) circuit, sensor, sound
Frequency circuit, WiFi module etc..Wherein, sensor such as optical sensor, motion sensor and other sensors.Certainly, empty
Device is adjusted to can also configure the other sensors such as gyroscope, barometer, hygrometer, thermometer, infrared sensor, it is no longer superfluous herein
It states.
It will be understood by those skilled in the art that air conditioner structure shown in Fig. 1 does not constitute the restriction to air conditioner, it can
To include either combining certain components or different components arrangement than illustrating more or fewer components.
As shown in Figure 1, as may include that operating system, network are logical in a kind of memory 1005 of computer storage media
The changeover program of letter module, Subscriber Interface Module SIM and pfc circuit.
In air conditioner shown in Fig. 1, network interface 1004 be mainly used for connect background server, with background server into
Row data communication；User interface 1003 is mainly used for connecting client (user terminal), with client into row data communication；And it handles
Device 1001 can be used for calling the changeover program of the pfc circuit stored in memory 1005.
In the present embodiment, air conditioner includes：Totem pfc circuit, memory 1005, processing in the embodiment of the present invention
Device 1001 and it is stored in the pulse-width controlled program that can be run on the memory 1005 and on the processor 1001, wherein
When processor 1001 calls the pulse-width controlled program stored in memory 1005, pulse-width controlled provided by the embodiments of the present application is executed
Method.
The present invention also provides a kind of totem pfc circuits, implement for totem pfc circuit one of the present invention with reference to Fig. 2, Fig. 2
The electrical block diagram of example.
In the present embodiment, totem pfc circuit includes：Bridge circuit 20, reactor L, bus capacitor C, sampling resistor R
And control module 10.
Bridge circuit 20, which is equipped with, is connected as the multiple switch unit of bridge shape, the input terminal of the bridge circuit 20 with exchange
Power supply is connected, and output end is connected with load.
Reactor L is arranged between the bridge circuit 20 and the AC power.Reactor L savings is supplied from AC power
The electric power given as energy, by discharge the energy realize totem pfc circuit boosting and power factor improvement.
It is electrically connected with the output end of bridge circuit 20 after bus capacitor C is in parallel with load.
Sampling resistor R is arranged between the output end and bus capacitor C of bridge circuit 20, and specifically, sampling resistor R is set
It sets on the wiring between the cathode and the output end of bridge circuit 20 of bus capacitor C.
Control module 10 is used for when the electric current of sampling resistor R is more than predetermined current threshold, is controlled each in bridge circuit 20
A switch unit shutdown；And when the electric current of sampling resistor R is less than or equal to predetermined current threshold, the control module 10 is according to electricity
The input voltage Vs and input current of 20 input terminal of bridge circuit, on off state and each switch for controlling each switch unit are single
Pulsewidth when member conducting.
In the present embodiment, in totem pfc circuit operational process, control module 10 can obtain sampling resistor R in real time
Electric current, and judge whether the electric current of sampling resistor R got is more than predetermined current threshold, wherein in the electricity of sampling resistor R
When stream is more than predetermined current threshold, which controls each switch unit shutdown in bridge circuit 20, to realize the figure
Rise the overcurrent protection of column pfc circuit；When the electric current of sampling resistor R is less than or equal to predetermined current threshold, the control module 10
The input voltage and input current of 20 input terminal of bridge circuit are obtained, and according to the input voltage of 20 input terminal of bridge circuit and defeated
Enter electric current, controls the pulsewidth when on off state of each switch unit and each switching means conductive, and then each reducing
It is that each switch unit selects suitable pulsewidth, energy according to input voltage and input current while switch unit on-off times
Enough under the premise of meeting the current harmonics requirement of totem pfc circuit, improving the power factor of totem pfc circuit, reduce
On-off times improve efficiency to reduce switching loss.
Wherein, predetermined current threshold can be rationally arranged according to the demand of totem pfc circuit.
Further, in one embodiment, bridge circuit 20 includes first switch unit Q1, second switch unit Q2, the
Three switch unit Q3 and the 4th switch unit Q4.
First switch unit Q1 and second switch unit Q2 are connected in series to form the first branch, third switch unit Q3 and the
Four switch unit Q4 are connected in series to form the second branch, and the first branch is connected in parallel to form the bridge circuit with the second branch
20。
First switch unit Q1 is electrically connected via reactor L with AC power with the tie point of second switch unit Q2；The
Three switch unit Q3 are electrically connected with the tie point of the 4th switch unit Q4 with AC power.First switch unit Q1 is switched with third
The tie point of unit Q3 is electrically connected with the anode of bus capacitor C；The tie point of second switch unit Q2 and the 4th switch unit Q4
It is electrically connected with the cathode of bus capacitor C.
Specifically, first switch unit Q1, second switch unit Q2, third switch unit Q3 and the 4th switch unit Q4 are equal
Can be that MOSFET (partly lead by Metal-Oxide-Semiconductor Field-Effect TransIstor, metal oxide
Body field-effect transistor), such as super node MOSFET or SiC-MOSFET.Preferably, the source electrode of first switch unit Q1 and
The drain electrode of two switch unit Q2 is electrically connected, and tie point is electrically connected via reactor L with AC power；Third switch unit Q3's
Source electrode is electrically connected with the drain electrode of the 4th switch unit Q4, and tie point is electrically connected with AC power；The leakage of first switch unit Q1
Pole is electrically connected with the drain electrode of third switch unit Q3, and tie point is electrically connected with the anode of bus capacitor C；Second switch unit Q2
Source electrode be electrically connected with the source electrode of the 4th switch unit Q4, tie point is electrically connected with the cathode of bus capacitor C.
There is parasitic diode in the inside of first switch unit Q1.Parasitic diode is in the source of first switch unit Q1
The part of existing pn-junction between pole and drain electrode.The saturation voltage of first switch unit Q1 is (between the drain-source under on-state
Voltage) less than the positive voltage drop of parasitic diode.Flowed through in the source drain of first switch unit Q1 as a result, electric current with
It flows through electric current in parasitic diode to compare, voltage drop becomes smaller, or even can reduce conduction losses.It is easy-to-understand to and says, is connecing
Flowed through in the first switch unit Q1 of logical state electric current in the parasitic diode in the first switch unit Q1 of off-state
It flows through electric current to compare, conduction losses is made to become smaller.In addition, could also say that for other switch unit Q2~Q4 same.
Further, control module 10 includes：Current detecting unit 12, alternating voltage detection unit 13 and control unit
11。
The current detecting unit 12 is electrically connected with the input terminal of bridge circuit 20, the input terminal for detecting bridge circuit 20
Input current；The alternating voltage detection unit 13 is electrically connected with the input terminal of bridge circuit 20, for detecting bridge circuit 20
Input terminal input voltage.
The control unit 11 is electrically connected with current detecting unit 12 and the alternating voltage detection unit 13 respectively.The control
Unit 11 is used to, when the electric current of sampling resistor R is less than or equal to predetermined current threshold, be detected according to current detecting unit 12
Input current and the input voltage that detects of the alternating voltage detection unit 13, control each in the bridge circuit 20
The pulsewidth when on off state of switch unit and each switching means conductive.
Preferably, in another embodiment, control module 10 further includes：Drive protection location 14 and driving unit 15.
The driving protection location 14 is electrically connected with sampling resistor R and driving unit 15 respectively, the driving protection location 14
Electric current for acquiring sampling resistor R, and when the electric current of sampling resistor R is more than predetermined current threshold, send shutdown control letter
Number to the driving unit 15.The driving unit 15 is used for according to each in the shutdown control signal control bridge circuit 20 received
A switch unit shutdown, to realize the overcurrent protection of totem pfc circuit.
The control unit 11 is additionally operable to when the electric current of sampling resistor R is less than or equal to predetermined current threshold, according to electric current
The input voltage that the input current and alternating voltage detection unit 13 that detection unit 12 detects detect generates state control letter
Number, and state control signal is sent to driving unit 15；The driving unit 15 is additionally operable to according to the state control letter received
The on off state of each switch unit and pulsewidth when each switching means conductive in number control bridge circuit 20.
In other embodiments, which further includes busbar voltage detection unit 16, the busbar voltage detection list
Member 16 is electrically connected with the input terminal of load, the busbar voltage for detecting the load.The busbar voltage detection unit 16 and control
Unit 11 processed is electrically connected, which is additionally operable to when the busbar voltage of the load detected is in outside preset range, is sent out
Send shutdown control signal to driving unit 15, which is used for according to the shutdown control signal control electric bridge electricity received
Each switch unit shutdown in road 20, to realize overvoltage/under-voltage protection of the middle load of totem pfc circuit.
The totem pfc circuit that the present embodiment proposes is less than or equal to predetermined current threshold by the electric current in sampling resistor R
When value, control module 10 controls opening for each switch unit according to the input voltage and input current of 20 input terminal of bridge circuit
Pulsewidth when off status and each switching means conductive realizes while reducing each switch unit on-off times, root
It is that each switch unit selects suitable pulsewidth according to input voltage and input current, it can be in the electricity for meeting totem pfc circuit
Under the premise of the power factor for flowing harmonic requirement, improvement totem pfc circuit, on-off times are reduced, flow through short-circuit electricity to reduce
The number of stream, and then reduce switching loss while idle work power in reducing circuit, improve the effect of totem pfc circuit
Rate.
The present invention also provides a kind of pulse width control methods, implement for pulse width control method first of the present invention with reference to Fig. 3, Fig. 3
The flow diagram of example.
In the present embodiment, which is applied to the totem pfc circuit of above-described embodiment.
The pulse width control method includes the following steps：
Step S100 determines bridge circuit input terminal when the electric current of sampling resistor R is less than or equal to predetermined current threshold
Input voltage currently whether there is positive and negative switching；
In the present embodiment, the control module of totem pfc circuit can acquire the electric current of sampling resistor R in real time, obtain
To sampling resistor R electric current when, the control module determine sampling resistor R electric current whether be more than predetermined current threshold, if sampling
The electric current of resistance R is less than or equal to predetermined current threshold, it is determined that the input voltage of bridge circuit input terminal currently whether there is
Positive and negative switching.
It specifically, can be by driving protection location real if control module includes driving protection location and driving unit
When acquisition sampling resistor R electric current.When the electric current of sampling resistor R is less than or equal to predetermined current threshold, exchange is obtained in real time
The input voltage (i.e. AC supply voltage Vs) that voltage detection unit detects, and judge whether AC supply voltage Vs carries out
Positive and negative switching (whether having reached zero passage).
Step S200 determines the input of input terminal after positive and negative switching in the input voltage there is currently when positive and negative switching
Whether voltage is in positive half period；
In the present embodiment, in input voltage the input of input terminal after positive and negative switching is determined there is currently when positive and negative switching
Whether voltage is in positive half period, that is, determines whether the input voltage of currently detected input terminal is more than 0V, in input voltage
When more than 0V, the input voltage of input terminal is in positive half period after positive and negative switching, otherwise, the input electricity of input terminal after positive and negative switching
Pressure is in negative half-cycle.
Step S300 controls the first switch when input voltage of input terminal is in positive half period after positive and negative switching
Unit Q1, second switch unit Q2 and the Q3 shutdowns of third switch unit, control the 4th switch unit Q4 conductings, and be based on arteries and veins
Rush the input current of change frequency, pulse interval and the input terminal, control second switch unit Q2, first switch list
Pulsewidth when first Q1 is alternately turned on/disconnects and the second switch unit Q2 is connected；
Step S400 controls the first switch when input voltage of input terminal is in negative half-cycle after positive and negative switching
Unit Q1, second switch unit Q2 and the 4th switch unit Q4 shutdowns, and the third switch unit Q3 conductings are controlled, and be based on
The input current of pulse change number, pulse interval and the input terminal, control first switch unit Q1, second switch
Pulsewidth when unit Q2 is alternately turned on/disconnects and the first switch unit Q1 is connected.
Wherein, pulse change number and pulse interval can be prestored, which can be first
Switch unit Q1 and second switch unit Q2 is by turning off to the change frequency of conducting or the change frequency by being conducted to shutdown.
When the input voltage of input terminal is in positive half period after positive and negative switching, pulse interval refers to second switch unit Q2 from pass
The disconnected moment is to the time interval between turn-on instant；When the input voltage of input terminal is in negative half-cycle after positive and negative switching, arteries and veins
It refers to first switch unit Q1 from the shutdown moment to the time interval between turn-on instant to rush time interval；The pulse interval
Number it is consistent with pulse change number.
For example, when pulse change number is 2, pulse interval includes first time interval and the second time interval.
If the input voltage of input terminal is in positive half period after positive and negative switching, control module controls first switch unit Q1 shutdowns, the
When two switch unit Q2 shutdowns, third switch unit Q3 shutdowns, the 4th switch unit Q4 conductings, according to defeated in first time interval
The input current for entering end calculates a pulsewidth (high level duration), when the conducting duration of the 4th switch unit Q4 reaches first
Between when being spaced, the Q2 conductings of second switch unit are controlled in the pulsewidth, reach the arteries and veins in the conducting duration of second switch unit Q2
When wide, first switch unit Q1 conductings, the Q2 shutdowns of second switch unit are controlled in the second time interval, and be based on for the second time
The input current of input terminal calculates another pulsewidth in interval, reaches the second time interval in the conducting duration of first switch unit Q1
When, second switch unit Q2 conductings, the Q1 shutdowns of first switch unit are controlled in another pulsewidth, then in second switch unit Q2
Conducting duration when reaching another pulsewidth, control first switch unit Q1 conductings, the Q2 shutdowns of second switch unit, then prison in real time
The current input current of input terminal is surveyed, when detecting that the current input current of input terminal reaches 0 and drops to 0, first is controlled and opens
Close unit Q1 shutdowns.
If the input voltage of input terminal is in negative half-cycle after positive and negative switching, control module controls first switch unit Q1
When shutdown, second switch unit Q2 shutdowns, the 4th switch unit Q4 shutdowns, the Q3 conductings of third switch unit, according at the first time
The input current of input terminal calculates a pulsewidth (high level duration) in interval, is up in the conducting of third switch unit Q3
When to first time interval, the Q1 conductings of first switch unit are controlled in the pulsewidth, in the conducting duration of first switch unit Q1
When reaching the pulsewidth, second switch unit Q2 conductings, the Q1 shutdowns of first switch unit are controlled in the second time interval, and be based on
The input current of input terminal calculates another pulsewidth in second time interval, reaches second in the conducting duration of second switch unit Q2
When time interval, first switch unit Q1 conductings, the Q2 shutdowns of second switch unit are controlled in another pulsewidth, is then opened first
When the conducting duration of pass unit Q1 reaches another pulsewidth, control second switch unit Q2 conductings, the Q1 shutdowns of first switch unit, and
The current input current of real-time monitor input terminal afterwards, when detecting that the current input current of input terminal reaches 0 and drops to 0, control
Second switch unit Q2 shutdowns processed.
When the input voltage of input terminal is in positive half period after positive and negative switching, third switch unit Q3 shutdowns, the 4th open
Unit Q4 is closed, if second switch unit Q2 conductings, the Q1 shutdowns of first switch unit, totem pfc circuit carries out improvement work(at this time
The operation of rate factor, the circuital current Is (input current of bridge circuit input terminal) for flowing through totem pfc circuit are short circuit electricity
Stream, and short circuit current sequence flows through AC power-the 4th switch unit Q4- alternating currents of reactor L- second switch units Q2-
Source, at this time reactor L energy is put aside by short circuit current.Correspondingly, the input voltage of input terminal is in negative after positive and negative switching
When the half period, third switch unit Q3 conductings, the 4th switch unit Q4 shutdowns, if second switch unit Q2 shutdowns, first switch
Unit Q1 is connected, and totem pfc circuit improve the operation of power factor at this time, flows through the circuit electricity of totem pfc circuit
It is short circuit current to flow Is (input current of bridge circuit input terminal), and short circuit current sequence flows through AC power-third and opens
Unit Q3- first switch unit Q1- reactor L- AC powers are closed, reactor L puts aside energy by short circuit current at this time.
When the input voltage of input terminal is in positive half period after positive and negative switching, third switch unit Q3 shutdowns, the 4th open
Unit Q4 conductings are closed, if second switch unit Q2 shutdowns, the Q1 conductings of first switch unit, totem pfc circuit carries out same at this time
Rectifying action is walked, is sampled according to AC power-reactor L- first switch unit Q1- bus capacitors C- in totem pfc circuit
The sequential flow oversampling circuit electric current Is (input current of bridge circuit input terminal) of the 4th switch unit Q4- AC powers of resistance R-,
The energy put aside in reactor L is discharged to bus capacitor C, is boosted to the DC voltage of bus capacitor C.Correspondingly,
When the input voltage of input terminal is in negative half-cycle after positive and negative switching, third switch unit Q3 conductings, the 4th switch unit Q4 are closed
Disconnected, if second switch unit Q2 conductings, the Q1 shutdowns of first switch unit, totem pfc circuit synchronizes rectifying action at this time,
According to AC power-third switch unit Q3- bus capacitor C- sampling resistor R- second switch units in totem pfc circuit
The sequential flow oversampling circuit electric current Is (input current of bridge circuit input terminal) of Q2- reactor L- AC powers, to bus capacitor C
The energy put aside in reactor L is discharged, is boosted to the DC voltage of bus capacitor C.
By above-mentioned short circuit current, the distortion of current waveform can be reduced, make current waveform close to sine wave, Jin Erneng
Enough improve the power factor of totem pfc circuit, and the higher hamonic wave associated with higher harmonic current can be inhibited.Also,
By calculating the pulsewidth of second switch unit Q2 or first switch unit Q1 according to the busbar voltage of load, figure can be rationally adjusted
The duration for rising column pfc circuit short circuit currents rationally controls time of each switch conduction/shutdown according to pulse change number
Number can reduce the conduction losses of switch unit, reduce switching loss, improve efficiency.
For example, when load is the compressor of air conditioner, with the rising of rotating speed, the induced voltage of compressor is got higher, pressure
Contracting machine becomes difficult to drive, but by being alternately carried out above-mentioned " power-factor improvement action " and " synchronous rectification action "
It boosts, can improve the permission limit of motor speed.
It should be noted that when pulse change number is other preset values, the control of step S300 and step S400
Control process when process and pulse change number are 2 is similar, and details are not described herein.
Further, in another embodiment, pulse width control method further includes：It is more than in the electric current of the sampling resistor R pre-
If when current threshold, controlling the first switch unit Q1, second switch unit Q2, third switch unit Q3 and described respectively
Four switch unit Q4 shutdowns.
In the present embodiment, in totem pfc circuit operational process, control module can obtain sampling resistor R's in real time
Electric current, and judge whether the electric current of the sampling resistor R got is more than predetermined current threshold, wherein in the electric current of sampling resistor R
When more than predetermined current threshold, which controls each switch unit shutdown in bridge circuit, to realize totem PFC
The overcurrent protection of circuit.
Further, in another embodiment, which further includes：The busbar voltage of detection load in real time,
When the busbar voltage of the load detected is in outside preset range, each switch unit shutdown in bridge circuit is controlled, that is, is distinguished
The first switch unit Q1, second switch unit Q2, third switch unit Q3 and the 4th switch unit Q4 shutdowns are controlled,
To realize overvoltage/under-voltage protection of the middle load of totem pfc circuit.
The pulse width control method that the present embodiment proposes is less than or equal to predetermined current threshold by the electric current in sampling resistor R
When value, determine that the input voltage of bridge circuit input terminal currently whether there is positive and negative switching, it is then current in the input voltage
There are when positive and negative switching, determining whether the input voltage of input terminal after positive and negative switching is in positive half period, then in positive and negative switching
When the input voltage of input terminal is in positive half period afterwards, the first switch unit Q1, second switch unit Q2 and third are controlled
Switch unit Q3 shutdown, and control the 4th switch unit Q4 conductings, and based on pulse change number, pulse interval with
And the input current of the input terminal, control second switch unit Q2, first switch unit Q1 are alternately turned on/disconnect, and
Pulsewidth when the second switch unit Q2 conductings, or the input voltage of input terminal is in negative half-cycle after positive and negative switching
When, the first switch unit Q1, second switch unit Q2 and the 4th switch unit Q4 shutdowns are controlled, and control the third and open
Close unit Q3 conductings, and the input current based on pulse change number, pulse interval and the input terminal, control first
Pulsewidth when switch unit Q1, second switch unit Q2 are alternately turned on/disconnect and the first switch unit Q1 is connected；
By calculating the pulsewidth of second switch unit Q2 or first switch unit Q1 according to the input current of input terminal, can rationally adjust
The duration of totem pfc circuit short circuit currents, improve totem pfc circuit power factor, and can inhibit with
The associated higher hamonic wave of higher harmonic current rationally controls the number of each switch conduction/shutdown according to pulse change number, with
The number for reducing short circuit current flow, can rationally take into account the improvement of power factor and switching loss in totem pfc circuit,
And then reduce switching loss while idle work power in reducing circuit, improve the efficiency of totem pfc circuit.
Based on first embodiment, the second embodiment of pulse width control method of the present invention is proposed, with reference to Fig. 4, in the present embodiment
In, pulse change number is 3 times, and the pulse interval includes that the first preset duration, the second preset duration and third are default
Duration.Wherein, the first preset duration, the second preset duration and third preset duration can be according to the need of the totem pfc circuit
It asks and is reasonably arranged.
Step S300 includes；
Step S310, the first input current based on the input terminal in the first preset duration calculate the first pulsewidth；
In the present embodiment, the first switch unit Q1, second switch unit Q2 and third switch unit Q3 are being controlled
When turning off, and controlling the 4th switch unit Q4 conductings, the first input current of input terminal in the first preset duration is obtained, and
The first pulsewidth is calculated according to first input current afterwards, wherein can be in the first preset duration to the input current of input terminal
It carries out stochastical sampling and obtains the first input current, alternatively, multiple sampling instants are arranged in the first preset duration, obtain multiple adopt
Sample moment corresponding input current, is then calculated the mean value of the corresponding input current of multiple sampling instants, which is made
For the first input current.
Specifically, step S310 includes：Obtain the corresponding default maximum pulse width of first pulsewidth and corresponding first
Predetermined current, default minimum pulse width and corresponding second predetermined current, and based on the default maximum pulse width, the first default electricity
Stream, default minimum pulse width, the second predetermined current and first input current, first arteries and veins is calculated according to linear interpolation algorithm
It is wide.
Wherein, can the corresponding default maximum pulse width of the first pulsewidth and correspondence be rationally set previously according to the demand of pfc circuit
The first predetermined current, the default parameters such as minimum pulse width and corresponding second predetermined current, when getting the first input current,
First pulsewidth is calculated according to linear interpolation algorithm based on the first input current, and then is rationally arranged second switch unit Q2's
First pulsewidth, rationally to adjust the duration of totem pfc circuit short circuit currents.
Step S320, when the conducting duration of the 4th switch unit Q4 reaches first preset duration, described
The control second switch unit Q2 conductings in first pulsewidth；
In the present embodiment, it is connected by controlling the second switch unit Q2 in the first pulsewidth so that totem PFC
Circuit short circuit current flow makes current waveform close to sine wave to reduce the distortion of current waveform, and then can improve totem
The power factor of pfc circuit, and the higher hamonic wave associated with higher harmonic current can be inhibited.
Step S330, when the conducting duration of the second switch unit Q2 reaches first pulsewidth, described second
The control first switch unit Q1 conductings, second switch unit Q2 shutdowns in preset duration, and it is pre- based on described second
If the second input current of the input terminal calculates the second pulsewidth in duration；
In the present embodiment, the acquisition mode of the second input current is similar with the first input current, and details are not described herein.?
Can be that the calculation similar with the first pulsewidth is arranged in the second pulsewidth.It is preset most it should be noted that the second pulsewidth is corresponding
Big pulsewidth, the corresponding predetermined current of default maximum pulse width, the corresponding default minimum pulse width of the second pulsewidth and default minimum pulse width pair
The parameters such as the predetermined current answered, can be identical as the parameter of the first pulsewidth, can also be arranged according to the demand of totem pfc circuit
Different parameters.
Step S340, when the conducting duration of the first switch unit Q1 reaches second preset duration, described
The control second switch unit Q2 conductings, first switch unit Q1 shutdowns in second pulsewidth；
In the present embodiment, by controlling the second switch unit Q2 conductings, first switch unit in the first pulsewidth
Q1 is turned off so that totem pfc circuit short circuit current flow makes current waveform close to sine to reduce the distortion of current waveform
Wave, and then the power factor of totem pfc circuit can be improved, and high order associated with higher harmonic current can be inhibited humorous
Wave.
Step S350, when the conducting duration of the second switch unit Q2 reaches second pulsewidth, in the third
The control first switch unit Q1 conductings, second switch unit Q2 shutdowns in preset duration, and it is pre- based on the third
If the third input current of the input terminal calculates third pulsewidth in duration；
In the present embodiment, the acquisition mode of third input current is similar with the first input current/second input current,
This is repeated no more.Or the calculation similar with the first pulsewidth/second pulsewidth is arranged in third pulsewidth.It needs to illustrate
It is the corresponding default maximum pulse width of third width, the corresponding predetermined current of default maximum pulse width, the corresponding default minimum of third pulsewidth
The parameters such as pulsewidth and the corresponding predetermined current of default minimum pulse width, can be identical as the parameter of the pulsewidth of the first pulsewidth/second, also may be used
Different parameters to be arranged according to the demand of totem pfc circuit.
Step S360, when the conducting duration of the first switch unit Q1 reaches the third preset duration, described
The control second switch unit Q2 conductings, first switch unit Q1 shutdowns in third pulsewidth；
In the present embodiment, by controlling the second switch unit Q2 conductings, first switch unit in third pulsewidth
Q1 is turned off so that totem pfc circuit short circuit current flow makes current waveform close to sine to reduce the distortion of current waveform
Wave, and then the power factor of totem pfc circuit can be improved, and high order associated with higher harmonic current can be inhibited humorous
Wave.
Step S370, when the conducting duration of the second switch unit Q2 reaches the third pulsewidth, control described the
One switch unit Q1 conductings, second switch unit Q2 shutdowns.
It is the driving pulse of AC supply voltage Vs, circuital current Is and switch unit Q1~Q4 with reference to Fig. 5, Fig. 5
The schematic diagram of time change, in Fig. 5, T1, T2, T3 are respectively the first preset duration, the second preset duration and third preset duration,
D1, D2, D3 are respectively the first pulsewidth, the second pulsewidth, third pulsewidth, in the positive half period of alternating voltage, the 4th switch unit Q4
Conducting, the Q3 shutdowns of third switch unit；After voltage zero-cross delay time T1, the Q2 conductings of second switch unit；Second switch list
After first Q2 turn-on times D1, the Q2 shutdowns of second switch unit, the Q1 conductings of first switch unit；First switch unit Q1 turn-on times
After T2, the Q1 shutdowns of first switch unit, the Q2 conductings of second switch unit；After second switch unit Q2 turn-on times D2, second opens
Close unit Q2 shutdowns, the Q1 conductings of first switch unit；After first switch unit Q1 turn-on times T3, first switch unit Q1 is closed
Disconnected, second switch unit Q2 is connected, after turn-on time D3, the Q2 shutdowns of second switch unit, and the Q1 conductings of first switch unit.Such as
This, Q1 and Q2 alternate conductions/shutdown 3 times, wherein when second switch unit Q2 is connected, the input current of totem pfc circuit
Is (circuital current) rises, and when first switch unit Q1 is connected, input current declines.
Further, in one embodiment, after step s 370, further include：Detecting that the input terminal is current
When input current reaches 0, the first switch unit Q1 shutdowns are controlled.
With reference to Fig. 5, first switch unit Q1 is turned off before the positive half period of alternating voltage terminates, can be prevented from busbar
Capacitance C flows through adverse current electric current.
The pulse width control method that the present embodiment proposes, by being based on the first input current, the second input current third inputs
The first pulsewidth that Current calculation obtains, the second pulsewidth, third pulsewidth, and respectively in the first pulsewidth, the second pulsewidth, third pulsewidth control
Second switch unit Q2 processed conducting, the Q1 shutdowns of first switch unit so that the first pulsewidth, the second pulsewidth, totem in third pulsewidth
Column pfc circuit respectively flows through the short circuit current of different durations, can rationally adjust totem pfc circuit short circuit currents
Duration can improve the power factor of totem pfc circuit to reduce the distortion of current waveform, and can inhibit with
The associated higher hamonic wave of higher harmonic current, while reducing switching loss according to pulse change number, improving efficiency, rationally
Take into account the power factor of totem pfc circuit.
Based on second embodiment, the 3rd embodiment of pulse width control method of the present invention is proposed, with reference to Fig. 6, in the present embodiment
In, step S400 includes；
Step S410, the 4th input current based on the input terminal in the first preset duration calculate the 4th pulsewidth；
Step S420, when the conducting duration of the 4th switch unit Q4 reaches first preset duration, described
The control first switch unit Q1 conductings in 4th pulsewidth；
Step S430, when the conducting duration of the first switch unit Q1 reaches four pulsewidth, described second
The control second switch unit Q2 conductings, first switch unit Q1 shutdowns in preset duration, and it is pre- based on described second
If the 5th input current of the input terminal calculates the 5th pulsewidth in duration；
Step S440, when the conducting duration of the second switch unit Q2 reaches five preset duration, described
The control first switch unit Q1 conductings, second switch unit Q2 shutdowns in 5th pulsewidth；
Step S450, when the conducting duration of the first switch unit Q1 reaches five pulsewidth, in the third
The control second switch unit Q2 conductings, first switch unit Q1 shutdowns in preset duration, and it is pre- based on the third
If the 6th input current of the input terminal calculates the 6th pulsewidth in duration；
Step S460, when the conducting duration of the second switch unit Q2 reaches the third preset duration, described
The control first switch unit Q1 conductings, second switch unit Q2 shutdowns in 6th pulsewidth；
Step S470, when the conducting duration of the first switch unit Q1 reaches six pulsewidth, control described the
Two switch unit Q2 conductings, first switch unit Q1 shutdowns.
In the present embodiment, the acquisition mode of the four/five/six input current is similar with the first/bis-/tri- input currents,
This is repeated no more.Or the calculation similar with the first/bis-/tri- pulsewidths is arranged in the four/five/six pulsewidth.It needs to illustrate
, the corresponding default maximum pulse width of the four/five/six pulsewidth, the corresponding predetermined current of default maximum pulse width, the four/five/six arteries and veins
The parameters such as the corresponding default minimum pulse width of width and the corresponding predetermined current of default minimum pulse width, can be with the first/bis-/tri- pulsewidths
Parameter is identical, and different parameters can also be arranged according to the demand of totem pfc circuit.
In the present embodiment, by controlling the first switch unit Q1 in the pulsewidth of the pulsewidth of the 4th pulsewidth/the 5th/the 6th
Conducting, the Q2 shutdowns of second switch unit so that totem pfc circuit short circuit current flow can rationally adjust totem PFC electricity
The duration of road short circuit currents, and then the power factor of totem pfc circuit can be improved.
With reference to Fig. 5, in the negative half-cycle of alternating voltage, the 4th switch unit Q4 shutdowns, third switch unit Q3 are connected,
D1, D2, D3 are respectively the 4th pulsewidth, the 5th pulsewidth, the 6th pulsewidth；After voltage zero-cross delay time T1, first switch unit
Q1 is connected；After first switch unit Q1 turn-on times D1, the Q2 conductings of second switch unit, the Q1 shutdowns of first switch unit；Second
After switch unit Q2 turn-on times T2, the Q2 shutdowns of second switch unit, the Q1 conductings of first switch unit；First switch unit Q1 is led
After logical time D2, the Q1 shutdowns of first switch unit, the Q2 conductings of second switch unit；After second switch unit Q2 turn-on times T3,
The Q2 shutdowns of second switch unit, first switch unit Q1 is connected, after turn-on time D3, first switch unit Q1, and second switch list
First Q2 conductings.In this way, Q1 and Q2 alternate conductions/shutdown 3 times, wherein when second switch unit Q2 is connected, totem PFC electricity
The input current Is (circuital current) on road rises, and when first switch unit Q1 is connected, input current declines.
Further, in one embodiment, after step S470, further include：Detecting that the input terminal is current
When input current reaches 0, the second switch unit Q2 shutdowns are controlled.
With reference to Fig. 5, second switch unit Q2 is turned off before the negative half-cycle of alternating voltage terminates, can be prevented from busbar
Capacitance C flows through adverse current electric current.
The pulse width control method that the present embodiment proposes, by being based on the 4th input current, the 5th input current third inputs
The 4th pulsewidth, the 5th pulsewidth, the 6th pulsewidth that Current calculation obtains, and respectively in the first pulsewidth, the 5th pulsewidth, the 6th pulsewidth control
First switch unit Q1 processed conducting, the Q2 shutdowns of second switch unit so that the 4th pulsewidth, the 5th pulsewidth, totem in the 6th pulsewidth
Column pfc circuit respectively flows through the short circuit current of different durations, can rationally adjust totem pfc circuit short circuit currents
Duration can improve the power factor of totem pfc circuit to reduce the distortion of current waveform, and can inhibit with
The associated higher hamonic wave of higher harmonic current, while reducing switching loss according to pulse change number, improving efficiency, rationally
Take into account the power factor of totem pfc circuit.
In addition, the embodiment of the present invention also proposes a kind of computer readable storage medium, the computer readable storage medium
On be stored with pulse-width controlled program, the pulse-width controlled program realizes the step of above-mentioned pulse width control method when being executed by processor
Suddenly.
It should be noted that herein, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that process, method, article or system including a series of elements include not only those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or system institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including this
There is also other identical elements in the process of element, method, article or system.
The embodiments of the present invention are for illustration only, can not represent the quality of embodiment.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can add the mode of required general hardware platform to realize by software, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on this understanding, technical scheme of the present invention substantially in other words does the prior art
Going out the part of contribution can be expressed in the form of software products, which is stored in one as described above
In storage medium (such as ROM/RAM, magnetic disc, CD), including some instructions use so that a station terminal equipment (can be mobile phone,
Computer, server, air conditioner or network equipment etc.) execute method described in each embodiment of the present invention.
It these are only the preferred embodiment of the present invention, be not intended to limit the scope of the invention, it is every to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (13)
1. a kind of totem pfc circuit, which is characterized in that the totem pfc circuit includes：
Bridge circuit, the bridge circuit are equipped with the multiple switch unit for being connected as bridge shape, the input of the bridge circuit
End is connected with AC power, and output end is connected with load；
Reactor, the reactor are arranged between the bridge circuit and the AC power；
Bus capacitor is electrically connected after the bus capacitor is in parallel with the load with the output end of the bridge circuit；
Sampling resistor, the sampling resistor are arranged between the output end and the bus capacitor of the bridge circuit；
Control module, the control module is used for when the electric current of the sampling resistor is more than predetermined current threshold, described in control
Each switch unit shutdown in bridge circuit；And when the electric current of the sampling resistor is less than or equal to predetermined current threshold, root
According to the input voltage and input current of the bridge circuit input terminal, controls the on off state of each switch unit and each open
Close pulsewidth when unit conducting.
2. totem pfc circuit as described in claim 1, which is characterized in that the bridge circuit include first switch unit,
Second switch unit, third switch unit and the 4th switch unit；
The first switch unit and the second switch unit are connected in series to form the first branch, the third switch unit with
4th switch unit is connected in series to form the second branch, and the first branch is connected in parallel to form the electricity with the second branch
Bridge circuit；
The tie point of the first switch unit and the second switch unit is electric via the reactor and the AC power
Connection；The third switch unit is electrically connected with the tie point of the 4th switch unit with the AC power；
The first switch unit is electrically connected with the tie point of the third switch unit with the anode of the bus capacitor；It is described
Second switch unit is electrically connected with the tie point of the 4th switch unit with the cathode of the bus capacitor.
3. totem pfc circuit as described in claim 1, which is characterized in that the control module includes：
Current detecting unit, the current detecting unit are electrically connected with the input terminal of the bridge circuit, for detecting the electricity
The input current of the input terminal of bridge circuit；
Alternating voltage detection unit, the alternating voltage detection unit is electrically connected with the input terminal of the bridge circuit, for examining
Survey the input voltage of the input terminal of bridge circuit；
Control unit, described control unit are electrically connected with the current detecting unit and the alternating voltage detection unit respectively,
When being less than or equal to predetermined current threshold for the electric current in the sampling resistor, detected according to the current detecting unit
It is single to control each switch in the bridge circuit for the input voltage that input current and the alternating voltage detection unit detect
The pulsewidth when on off state of member and each switching means conductive.
4. totem pfc circuit as claimed in claim 3, which is characterized in that the control module further includes：Driving protection is single
Member and driving unit；
The driving protection location is electrically connected with the sampling resistor and the driving unit respectively, for acquiring the sampling
The electric current of resistance, and when the electric current of the sampling resistor is more than predetermined current threshold, shutdown control signal is sent to the drive
Moving cell；
The driving unit is used to control each switch unit in the bridge circuit according to the shutdown control signal received and close
It is disconnected；
Described control unit is additionally operable to when the electric current of the sampling resistor is less than or equal to predetermined current threshold, according to the electricity
The input voltage that the input current and the alternating voltage detection unit that stream detection unit detects detect generates state control
Signal, and the state control signal is sent to the driving unit；
The driving unit is additionally operable to control each switch unit in the bridge circuit according to the state control signal received
On off state and pulsewidth when each switching means conductive.
5. a kind of pulse width control method, which is characterized in that be applied to the totem pfc circuit described in claim 2, the pulsewidth
Control method includes the following steps：
When the electric current of sampling resistor is less than or equal to predetermined current threshold, determine that the input voltage of bridge circuit input terminal is current
With the presence or absence of positive and negative switching；
In the input voltage, whether there is currently when positive and negative switching, determine the input voltage of input terminal after positive and negative switching in just
Half period；
When the input voltage of input terminal is in positive half period after positive and negative switching, the first switch unit, second switch are controlled
Unit and the shutdown of third switch unit, control the 4th switching means conductive, and based on pulse change number, between the burst length
Every and the input terminal input current, control second switch unit, first switch units alternately ground ON/OFF, and
Pulsewidth when the second switch unit conducting；
When the input voltage of input terminal is in negative half-cycle after positive and negative switching, the first switch unit, second switch are controlled
Unit and the shutdown of the 4th switch unit, control the third switching means conductive, and based on pulse change number, between the burst length
Every and the input terminal input current, control first switch unit, second switch units alternately ground ON/OFF, and
Pulsewidth when the first switch unit conducting.
6. pulse width control method as claimed in claim 5, which is characterized in that the pulse change number is 3 times, the pulse
Time interval includes the first preset duration, the second preset duration and third preset duration；It is described to be based on pulse change number, pulse
The input current of time interval and the input terminal, control second switch unit lead on/off to first switch units alternately
Open and the second switch unit be connected when pulsewidth the step of include：
The first input current based on the input terminal in the first preset duration calculates the first pulsewidth；
When the conducting duration of the 4th switch unit reaches first preset duration, institute is controlled in first pulsewidth
State the conducting of second switch unit；
When the conducting duration of the second switch unit reaches first pulsewidth, institute is controlled in second preset duration
The conducting of first switch unit, second switch unit shutdown are stated, and based on the input terminal in second preset duration
Second input current calculates the second pulsewidth；
When the conducting duration of the first switch unit reaches second preset duration, institute is controlled in second pulsewidth
State the conducting of second switch unit, first switch unit shutdown；
When the conducting duration of the second switch unit reaches second pulsewidth, institute is controlled in the third preset duration
The conducting of first switch unit, second switch unit shutdown are stated, and based on the input terminal in the third preset duration
Third input current calculates third pulsewidth；
When the conducting duration of the first switch unit reaches the third preset duration, institute is controlled in the third pulsewidth
State the conducting of second switch unit, first switch unit shutdown；
When the conducting duration of the second switch unit reaches the third pulsewidth, control first switch unit conducting,
The second switch unit shutdown.
7. pulse width control method as claimed in claim 6, which is characterized in that described to be based on the input in the first preset duration
End the first input current calculate the first pulsewidth the step of include：
Obtain the corresponding default maximum pulse width of first pulsewidth and corresponding first predetermined current, default minimum pulse width and correspondence
The second predetermined current, and based on the default maximum pulse width, the first predetermined current, default minimum pulse width, the second predetermined current
And first input current, calculate first pulsewidth according to linear interpolation algorithm.
8. pulse width control method as claimed in claim 6, which is characterized in that described in the conducting of the second switch unit
When length reaches the third pulsewidth, after controlling the step of first switch unit is connected, the second switch unit turns off,
Further include：
When detecting that the current input current of the input terminal reaches 0, the first switch unit shutdown is controlled.
9. pulse width control method as claimed in claim 6, which is characterized in that described based on pulse change number, burst length
The input current of interval and the input terminal, control first switch unit, second switch units alternately ground ON/OFF, with
And the step of pulsewidth when first switch unit conducting, includes：
The 4th input current based on the input terminal in the first preset duration calculates the 4th pulsewidth；
When the conducting duration of the 4th switch unit reaches first preset duration, institute is controlled in the 4th pulsewidth
State the conducting of first switch unit；
When the conducting duration of the first switch unit reaches four pulsewidth, institute is controlled in second preset duration
The conducting of second switch unit, first switch unit shutdown are stated, and based on the input terminal in second preset duration
5th input current calculates the 5th pulsewidth；
When the conducting duration of the second switch unit reaches five preset duration, institute is controlled in the 5th pulsewidth
State the conducting of first switch unit, second switch unit shutdown；
When the conducting duration of the first switch unit reaches five pulsewidth, institute is controlled in the third preset duration
The conducting of second switch unit, first switch unit shutdown are stated, and based on the input terminal in the third preset duration
6th input current calculates the 6th pulsewidth；
When the conducting duration of the second switch unit reaches the third preset duration, institute is controlled in the 6th pulsewidth
State the conducting of first switch unit, second switch unit shutdown；
When the conducting duration of the first switch unit reaches six pulsewidth, control second switch unit conducting,
The first switch unit shutdown.
10. pulse width control method as claimed in claim 9, which is characterized in that the conducting in the first switch unit
When duration reaches six pulsewidth, the step of controlling second switch unit conducting, first switch unit shutdown it
Afterwards, further include：
When detecting that the current input current of the input terminal reaches 0, the second switch unit shutdown is controlled.
11. the pulse width control method as described in any one of claim 5 to 10, which is characterized in that the pulse width control method
Further include：
When the electric current of the sampling resistor is more than predetermined current threshold, the first switch unit, second switch are controlled respectively
Unit, third switch unit and the 4th switch unit shutdown.
12. a kind of air conditioner, which is characterized in that the air conditioner includes：Totem pfc circuit, storage described in claim 2
Device, processor and it is stored in the pulse-width controlled program that can be run on the memory and on the processor, the pulsewidth control
The step of pulse width control method as described in any one of claim 5 to 11 is realized when processing procedure sequence is executed by the processor.
13. a kind of storage medium, which is characterized in that be stored with pulse-width controlled program, the pulse-width controlled on the storage medium
The step of pulse width control method as described in any one of claim 5 to 11 is realized when program is executed by processor.
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| CN201810560782.2A CN108809075B (en) | 2018-06-01 | 2018-06-01 | Totem pole PFC circuit, pulse width control method, air conditioner and storage medium |
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| WO2022041165A1 (en) * | 2020-08-29 | 2022-03-03 | 华为数字能源技术有限公司 | Power factor correction circuit and power converter |
| CN114963346A (en) * | 2022-05-06 | 2022-08-30 | 宁波奥克斯电气股份有限公司 | Totem-pole circuit, air conditioner external unit and air conditioner |
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| CN114963346A (en) * | 2022-05-06 | 2022-08-30 | 宁波奥克斯电气股份有限公司 | Totem-pole circuit, air conditioner external unit and air conditioner |
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