CN209545435U - Circuit of power factor correction and air conditioner - Google Patents
Circuit of power factor correction and air conditioner Download PDFInfo
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- CN209545435U CN209545435U CN201920713117.2U CN201920713117U CN209545435U CN 209545435 U CN209545435 U CN 209545435U CN 201920713117 U CN201920713117 U CN 201920713117U CN 209545435 U CN209545435 U CN 209545435U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The utility model provides a kind of circuit of power factor correction and air conditioner, wherein, circuit of power factor correction includes: power factor correction module, receives power supply signal, power factor correction module includes switching tube, and switching tube is configured as control power supply signal to load supplying；Switch drive module is connected to the driving input terminal of switching tube, is used for switch plumber block output switching signal；Control module is connected to switch drive module, opens output switching signal for control switch drive module or closes output switching signal；Overcurrent protection module is connect with control module, and overcurrent protection module includes for acquiring sampled signal, and sampled signal protects signal to turn off the switch the driving output of drive module for trigger control module if more than secure threshold to control module output protection signal.By the technical solution of the utility model, it can more directly detect whether rectifier exception occurs, the practicability of detection mode is higher.
Description
Technical field
The utility model relates to air-conditioning technical fields, in particular to a kind of circuit of power factor correction and a kind of sky
Adjust device.
Background technique
In the related technology, circuit of power factor correction (i.e. pfc circuit) using high-power MOS, (partly lead by metal-oxide-
Body) switching technique as main power device substitute IGBT (insulated gate bipolar transistor) device, utilize the low conduction impedance of MOS
The characteristic that characteristic replaces IGBT conduction voltage drop constant realizes the lower power consumption under middle low power, to realize the function for reducing air conditioner
Consumption.
Power factor correction module is constituted using four switching tubes, and using two half-bridge driven chip drivings, wherein one
A driving chip has defencive function, carries out over-current detection in conjunction with sampling resistor, if detecting high current, triggers closing to four
The driving of a switch exports, and to carry out overcurrent protection, but the program has the following deficiencies:
As shown in Figure 1, existing protection scheme can only realize that upper and lower Q1 and Q3 abnormal or upper and lower Q2 and Q4 occur and go out
Detection when now abnormal, and two switching tubes are protected since switch drive module itself built-in can interlock up and down in practical applications
Protection circuit, upper and lower bridge arm is straight-through to be difficult to occur, so the probability that the corresponding failure of the protection scheme occurs is very low, practicability compares
Difference.
Utility model content
The utility model aims to solve at least one of technical problems existing in the prior art or related technologies.
For this purpose, one of the utility model is designed to provide a kind of circuit of power factor correction.
Another of the utility model is designed to provide a kind of air conditioner.
To achieve the goals above, the embodiment of first aspect according to the present utility model provides a kind of power factor
Correcting circuit, comprising: power factor correction module receives power supply signal, and the power factor correction module includes switching tube, institute
It states switching tube and is configured as controlling the power supply signal to load supplying；Switch drive module is connected to the drive of the switching tube
Dynamic input terminal, is used for the switch plumber block output switching signal；Control module is connected to the switch drive module, is used for
The switch drive module is controlled to open the output switching signal or close the output switching signal；Overcurrent protection module,
It is connect with the control module, the overcurrent protection module includes the input current for acquiring the power factor correction module
And/or output electric current, and it is changed into the current sensor of sampled signal, sampled signal is if more than secure threshold, to the control
Module output protection signal, the protection signal is for triggering the output that the control module closes the switch drive module.
Wherein, current sensor can be Hall current sensor, and input current and/or output electric current are converted to voltage
Signal (i.e. sampled signal), according to the relationship between the voltage signal and corresponding secure threshold, it is determined whether to the control
Molding block output protection signal, the protection signal close the defeated of the switch drive module for triggering the control module
Out.
Secure threshold is used to indicate the voltage of current sensor position or the safety value of electric current.
Wherein, overcurrent protection module at least has following two structure type.
In the above-mentioned technical solutions, optionally, over-current protecting unit built in the current sensor, described in construction formation
Overcurrent protection module.
In the above-mentioned technical solutions, optionally, the overcurrent protection module includes: driving protection location, with the electric current
Sensor and control module connection, are used in the case where sampled signal is if more than secure threshold, to the control mould
Block output protection signal, the protection signal is for triggering the output that the control module closes the switch drive module.
In the technical scheme, Hall is set in the ac input end of power factor correction module and/or DC output end
Current sensor, position of the Hall current sensor based on setting acquire the input current of power factor correction module, or output
Electric current, and convert electrical current on voltage signal output driving protection location, to detect whether occurring by driving protection location
Flow phenomenon, with detecting that control stops to power factor correction module output switching signal in the case where there is over-current phenomenon avoidance,
On the one hand, since Hall current sensor is not in electrical contact with circuit-under-test, the power of tested power supply can not be consumed, therefore
The efficient low power consumption control of frequency conversion equipment is not influenced, on the other hand, since Hall current sensor directly acquires power factor school
The input terminal electric current and/or output end current of positive module make power factor correction module when executing different feature operations pair
The different current flow paths answered, such as diagonal bridge arm flow path, the left and right bridge arm flow path on top and the left and right bridge arm flow path of lower part etc.,
Circuit abnormality detection can be carried out by Hall current sensor, therefore can more directly detect whether rectifier goes out
It is now abnormal, and when determining that appearance is abnormal, can determine corresponding exceptional part under different operating conditions, relative to existing skill
The scheme of over-current detection is carried out in art using the driving chip combination sampling resistor with defencive function, limitation is smaller, and
More there is specific aim and practicability.
Hall current sensor is the sensing that a high current is transformed to secondary small voltage signal using Hall effect
Small voltage signal is enlarged into normal voltage, that is to say, that Hall current sensor is externally defeated by device, and associative operation amplifier
Voltage signal out, and be compared with the secure threshold built in driving protective module, determining in circuit according to the result of the comparison is
It is no short circuit overcurrent phenomenon occur, since Hall current sensor can both measure exchange, direct current can also be measured, therefore both can be with
The exchange input side of power factor correction module is set, the DC output side in power factor correction module also can be set.
In addition, detecting input current and/or output electric current by setting Hall current sensor, additionally it is possible to save sampling electricity
The setting of resistance, equally can be because of the energy consumption for reducing resistance, to achieve the purpose that reduce power consumption.
In any of the above-described technical solution, optionally, further includes: reactor is set to the PFC mould
Between block and AC power source；Zero crossing detection module is arranged between the zero line and zero line side of the AC power source, and is connected to
The control module, the zero crossing detection module are used to acquire the zero passage detection letter between the zero line and the zero line side
Number；The control module is also used to: determining the AC power source according to the zero passage detection signal that the zero crossing detection module exports
Phase state, with according to the phase state to the switch drive module output switch control signal, to control to described
Reactor carries out charging or reactor electric discharge, wherein the AC power source is for exporting the power supply signal.
In the technical scheme by the way that reactor to be arranged in the ac input end and alternating current of power factor correction module
Between source, AC power source carry out exchange output when, reactor the electric energy supplied from AC power source can be converted to magnetic energy with
As energy stores, and the boosting of pfc circuit and the improvement of power factor can be realized by discharging the energy.
Specifically, by the way that zero crossing detection module is arranged between firewire and zero curve, to judge to exchange by zero crossing detection module
The real-time phase of power supply, to be executed according to switching device different in different phase state driving power factor correcting modules
Switch operation, to realize rectification function or PFC (PFC) function respectively, to realize load end based on rectification function
Direct current supply, or controlled by PFC, make to exchange side voltage and ac-side current and reach consistent in phase.
In addition, there are many reason of generating over-current phenomenon avoidance, for example circuit is interfered and causes control module crash reset, or
Short circuit exception etc. occurs for reactor.
In any of the above-described technical solution, optionally, the Hall current sensor includes being arranged in the alternating current
The first Hall current sensor between source and the reactor, first Hall current sensor is for acquiring exchange end electricity
Pressure；The driving protection location is also used to: if detecting, the exchange end voltage is greater than the first secure threshold, to the control
Module exports the protection signal, to close the output of the switch drive module.
Wherein, the first secure threshold indicates the voltage security value of ac input end.
Wherein, the first Hall current sensor can be placed in any position of the concatenated firewire of reactor or zero curve.
In any of the above-described technical solution, optionally, the power factor correction module is opened by first switch tube, second
Guan Guan, third switching tube construct to be formed with the 4th switching tube, and first switch tube and second switch are set to PFC
The top of module, third switching tube and the 4th switching tube are set to the lower part of power factor correction module, first switch tube and the
Three switching tubes are set to the left part of power factor correction module, and second switch and the 4th switching tube are set to PFC
The right part of module, the first switch tube, the second switch, the third switching tube and the 4th switching tube are included
Freewheeling diode by the drain electrode of the first switch tube and the drain series of the second switch, and tie point is determined as
The cathode output end of the direct current output, by the source series of the source electrode of the third switching tube and the 4th switching tube, and will be even
Contact is determined as the cathode output end of the direct current output, and is grounded, and the source electrode of the first switch tube and the third are opened
The drain series of pipe are closed, and tie point is connected to the zero line, the source electrode of the second switch is opened with the described 4th
The drain series of pipe are closed, and tie point is connected to the zero line side.
In the technical scheme, the first Hall current is arranged by the ac input end in power factor correction module to sense
No matter device is executing rectifying operation or PFC operation, is having electric current to flow through the first work sensor, thus examining
When having measured electric current and flowing through hall device, which will export corresponding voltage, be opened according to the four of power factor correction module
The current value that pipe is able to bear is closed, is set in the over-current detection unit built in driving protection location or the first Hall current sensor
Surely voltage value to be protected is needed, first switch tube is connected on firewire between zero curve in second switch, and third switching tube is in
Four switching tubes are connected on firewire between zero curve, when the-the four switching tube of first switch tube-second switch or third switching tube
When there is abnormal overcurrent, which will be exported relevant voltage by Hall current sensor and trigger driving protection location, in turn
The switching signal of switch drive module is turned off, so that the overcurrent for realizing switch tube is protected, when overcurrent signal relief, driving protection
Unit will release control to excess flow switch drive module, to restore to work normally, thus during rectifying operation or power
The timely and effectively detection to the higher failure of likelihood ratio can be achieved during factor correcting, promote entire PFC electricity to reach
The purpose of the safety on road.
In any of the above-described technical solution, optionally, the Hall current sensor further includes being arranged in the direct current
Second Hall current sensor of the cathode output end of output, second Hall current sensor for acquire the power because
The output end voltage of number correction module；The driving protection location is also used to: if detecting, the DC terminal voltage is greater than second
Secure threshold then exports the protection signal to the control module, to close the output of the switch drive module.
Second secure threshold indicates the safe voltage value of the output end of power factor correction module.
In the technical scheme, on the basis of the first Hall current sensor is set, increase by second in DC output end
Hall current sensor, to acquire the DC bus current of outlet side, thus passing through power factor correction module rear end
Load carries out in direct current input process, and capable of effectively detecting the switching tube in power factor correction module excessively, overcurrent whether occur existing
As.
Wherein, the second Hall sensor can be placed on drain electrode that first switch tube is connected with second switch and rear class
Between load, that is, it is arranged between the anode of direct current output and motor drive module, or is switched in third switching tube and the 4th
Between the connected source electrode of pipe and successive load, that is, it is arranged between the second output terminal of direct current output and motor drive module.
Specifically, the voltage output signal of the first Hall current sensor and the second Hall current sensor is connected to driving
Protection location, when driving protection location detects the voltage of the first Hall current sensor and the output of the second Hall current sensor
Signal will be forced shutdown switch drive module beyond preset value, to protect the defencive function realized to four switching tubes.Wherein
First Hall current sensor be in order to protect when first switch tube and second switch occur short circuit it is abnormal when detection, or
Detection when short circuit exception occurs for third switching tube and the 4th switching tube, and the second Hall current sensor is to protect first to open
When short circuit exception occurs for detection or second switch and third switching tube when closing pipe and abnormal the 4th switching tube generation short circuit
Detection.
Wherein, those skilled in the art can understand that, any one of two Hall current sensors output electricity
Trigger protection unit is all acted beyond the preset value of MOS driving protection location and turns off two MOS driving units by pressure signal
Signal, two priority are identical.Over-current signal is fed back into MCU simultaneously after the protection location triggering of MOS driving simultaneously, notifies MCU
The output of shutdown switch signal.
In any of the above-described technical solution, optionally, the switch drive module includes for driving described first to open
The first switch drive module of third switching tube described in Guan Guanyu, and for driving the second switch to open with the described 4th
Close the second switch drive module of pipe.
In the technical scheme, switch drive module includes first switch drive module and second switch drive module, with
Realize the half-bridge driven of H bridge reorganizer.
In any of the above-described technical solution, optionally, further includes: bus capacitor is set to the PFC
Between the cathode output end and cathode output end of module.
Specifically, first switch tube, second switch, third switching tube and the 4th switching tube all can be MOSFET
(Metal-Oxide-Semiconductor Field-Effect TransIstor, metal oxide semiconductor field effect transistor
Pipe, i.e. metal-oxide-semiconductor), such as super node MOSFET or SiC-MOSFET.
The working method of metal-oxide-semiconductor, controls on-off between source electrode and drain electrode by grid and realizes and switch, and when conducting needs grid
Power supply is greater than source electrode power supply.
Optionally, the source electrode of first switch tube is electrically connected with the drain electrode of third switching tube, tie point via reactor with
AC power source electrical connection, the source electrode of second switch are electrically connected with the drain electrode of the 4th switching tube, tie point and AC power source electricity
Connection, the drain electrode of first switch tube are electrically connected with the drain electrode of second switch, and tie point is electrically connected with the anode of bus capacitor；
The source electrode of third switching tube is electrically connected with the source electrode of the 4th switching tube, and tie point is electrically connected with the cathode of bus capacitor.
In any of the above-described technical solution, optionally, the control module is also used to: if the input of the AC power source
Voltage is in positive half cycle, then controls the switch drive module output for making the first switch tube and the 4th switching tube
The switching signal of conducting, and bypass corresponding freewheeling diode；The control module is also used to: if the input of the AC power source
Voltage is in negative half period, then controls the switch drive module output for making the second switch and the third switching tube
The switching signal of conducting, and corresponding freewheeling diode is bypassed, to realize synchronous rectification.
Wherein, there is freewheeling diode in the inside of first switch tube, freewheeling diode is the source electrode in first switch tube
The saturation voltage (the drain source voltage across poles under on-state) of the part of existing PN junction between drain electrode, first switch tube is low
In the positive voltage drop of freewheeling diode.Electric current is flowed through in the source drain of first switch tube as a result, and in parasitic two poles
It flows through electric current in pipe to compare, voltage drop becomes smaller, or even can reduce conduction losses.It is easy-to-understand to and says, the of on-state
Electric current is flowed through in one switching tube compared with flowing through electric current in the freewheeling diode in the first switch tube in off-state, makes to be connected
Loss becomes smaller, in addition, being also suitable for other second switches, third switching tube and the 4th switching tube.
In the technical scheme, open-minded according to the phase state of alternating current by the principle using metal-oxide-semiconductor low conduction voltage drop
Low-power consumption synchronous rectification can be realized in corresponding metal-oxide-semiconductor.
Specifically, control module carries out exporting corresponding control according to the current alternating current phases that zero crossing detection module detects
Signal processed drives corresponding switching tube to work.
In the related technology, when synchronizing rectification, in AC power source positive half cycle, electric current is passed by the first Hall current
Sensor and reactor, then by first switch tube in the 4th switching tube freewheeling diode rectify to system power supply, at this time by
It is larger in freewheeling diode pressure drop, cause energy waste.
In the technical scheme, control module judges to start in the positive half cycle of AC power source according to zero crossing detection module at this time
When, electric current passes through the first Hall current sensor and reactor, and output switching signal drives first switch tube and the 4th switching tube
Conducting, makes to flow through that first switch tube, the electric current of freewheeling diode flows through MOS on the second Hall current sensor and the 4th switching tube
Pipe bypasses freewheeling diode, to reduce conduction loss using the low on state characteristic of metal-oxide-semiconductor.Similarly in AC power source negative half period
When, control module then controls and opens second switch and third switching tube, so that four metal-oxide-semiconductors is realized synchronous rectification, same
It walks in switching process, by by the current detecting on the first Hall current sensor and the second Hall current sensor, inspection
It surveys and whether over-current phenomenon avoidance occurs.
In any of the above-described technical solution, optionally, the control module is also used to: if the input of the AC power source
Voltage is in positive half cycle, then controls the third switching tube and described the according to the zero passage detection signal and the switching signal
The opening and closing of four switching tubes, the third switching tube is connected with the 4th switching tube, to charge to the reactor, turns off institute
Third switching tube and the 4th switching tube, the first switch tube conducting are stated, the reactor powers to the load；The control
Module is also used to: if the input voltage of the AC power source is in negative half period, being opened according to the zero passage detection signal with described
OFF signal controls the third switching tube and the 4th switching tube is opened and closed, and the third switching tube is led with the 4th switching tube
It is logical, to charge to the reactor, the third switching tube and the 4th switching tube are turned off, the second switch is driven
Pipe conducting, the reactor powers to the load, to realize PFC.
In the technical scheme, when circuit is used to carry out PFC operation, when input is in the positive half cycle of AC power source,
Control module drives third switching tube to be connected with the 4th switching tube, charges to reactor, work as pass according to zero passage detection signal
When disconnected third switching tube and four switching tubes, control module drives first switch tube to open, and the electric energy of reactor storage will pass through
First switch tube is released to late-class circuit, to bus capacitor and load (such as motor) power supply, in input in AC power source
When negative half period, control module drives third switching tube to be connected with the 4th switching tube according to zero passage detection signal, carries out to reactor
Charging, when turning off third switching tube and four switching tubes, control module drives second switch to open, the electricity of reactor storage
Energy will be released to late-class circuit by second switch, to bus capacitor and load (such as motor) power supply, by electric to bus
Hold the energy that release is put aside in reactor, boosts to the DC voltage of bus capacitor, so as to pass through short circuit current,
The distortion for reducing current waveform, makes current waveform close to sine wave, and then can improve the power factor of pfc circuit, further
Ground can reasonably adjust pfc circuit by calculating the pulsewidth of third switching tube or first switch tube according to the busbar voltage of load
The duration of short circuit currents rationally controls the number of each switch conduction/shutdown according to pulse change number, can reduce
The conduction losses of switch unit reduce switching loss, improve efficiency.
In any of the above-described technical solution, optionally, further includes: motor drive module is connected to the power factor
The DC output end of correction module, for receiving the direct current output of the power factor correction module, to load supplying；Direct current
Busbar voltage detection module is set between the cathode output end and cathode output end of the power factor correction module, is used for
Detect DC bus-bar voltage.
In the technical scheme, in the application scenarios that load is motor, motor drive module is used for constant voltage DC is inverse
Become three-phase alternating current output, powered with realizing to motor, in conjunction with the setting of DC bus-bar voltage detection module, by power because
The detection of the busbar voltage of the direct current output of number correction module and the detection of the input voltage, control PFC mould
Pulsewidth in block when switch state and each switching tube conducting of each switching tube member.
In any of the above-described technical solution, optionally, the control module is additionally coupled to motor drive module connection, with
For exporting inverter control signal to the motor drive module.
The embodiment of second aspect according to the present utility model provides a kind of air conditioner, comprising: such as the utility model
Circuit of power factor correction described in one side technical solution.
The additional aspect and advantage of the utility model will provide in following description section, partially will be from following description
In become obvious, or recognized by the practice of the utility model.
Detailed description of the invention
The above-mentioned and/or additional aspect and advantage of the utility model from the description of the embodiment in conjunction with the following figures will
Become obvious and be readily appreciated that, in which:
Fig. 1 shows the schematic diagram of circuit of power factor correction in the related technology；
Fig. 2 shows the schematic diagrames of the circuit of power factor correction of one embodiment according to the present utility model.
Specific embodiment
In order to be more clearly understood that the above objects, features, and advantages of the utility model, with reference to the accompanying drawing and have
The utility model is further described in detail in body embodiment.It should be noted that in the absence of conflict, this Shen
The feature in embodiment and embodiment please can be combined with each other.
Many details are explained in the following description in order to fully understand the utility model, still, this is practical
Novel to be implemented using other than the one described here other modes, therefore, the protection scope of the utility model is simultaneously
It is not limited by the specific embodiments disclosed below.
Embodiment one
As shown in Fig. 2, the circuit of power factor correction of one embodiment according to the present utility model, is suitable for air conditioner,
Include: power factor correction module 10, receives power supply signal, the power factor correction module 10 includes switching tube, described to open
It closes pipe and is configured as controlling the power supply signal to load supplying；Switch drive module is connected to the PFC mould
The driving input terminal of block 10 is used for the switching tube output switching signal；Control module 30 is connected to the switch driving mould
Block, for controlling, the switch drive module opens the output switching signal or closing exports the switching signal；Overcurrent is protected
Module is protected, is connect with the control module 30, the overcurrent protection module includes for acquiring the power factor correction module
10 input current and/or output electric current, and the Hall current sensor of voltage signal is converted to, if the voltage value of voltage signal
Greater than secure threshold, 30 output protection signal of Xiang Suoshu control module, the protection signal is for triggering the control module 30
Close the output of the switch drive module.
Wherein, overcurrent protection module at least has following two structure type.
Embodiment two
In the above-described embodiments, optionally, over-current protecting unit built in the Hall current sensor forms institute with construction
State overcurrent protection module.
Embodiment three
As shown in Fig. 2, in the above-described embodiments, optionally, the overcurrent protection module includes: driving protection location, with
The Hall current sensor and the control module 30 connect, for the case where sampled signal is if more than secure threshold
Under, 30 output protection signal of Xiang Suoshu control module, the protection signal closes described open for triggering the control module 30
Close the output of drive module.
In this embodiment, Hall is set in the ac input end and/or DC output end of power factor correction module 10
Current sensor, position of the Hall current sensor based on setting acquire the input current or defeated of power factor correction module 10
Electric current out, and convert electrical current on voltage signal output driving protection location 402, to be by the detection of driving protection location 402
It is no over-current phenomenon avoidance occur, with detect there is over-current phenomenon avoidance in the case where, control stop it is defeated to power factor correction module 10
Switching signal out, on the one hand, since Hall current sensor is not in electrical contact with circuit-under-test, tested power supply can not be consumed
Power, therefore the efficient low power consumption control of frequency conversion equipment is not influenced, on the other hand, since Hall current sensor directly acquires
The input terminal electric current and/or output end current of power factor correction module 10 keep power factor correction module different in execution
Corresponding difference current flow path can carry out circuit abnormality detection by Hall current sensor when feature operation, therefore can
More directly detect whether rectifier exception occurs, and when determining that appearance is abnormal, it can be true under different operating conditions
Fixed corresponding exceptional part, it is middle compared with the existing technology to be carried out using the driving chip combination sampling resistor with defencive function
The scheme of detection is flowed, limitation is smaller, and more has specific aim and practicability.
Hall current sensor is the sensing that a high current is transformed to secondary small voltage signal using Hall effect
Small voltage signal is enlarged into normal voltage, that is to say, that Hall current sensor is externally defeated by device, and associative operation amplifier
Voltage signal out, and be compared with the secure threshold built in driving protective module, determining in circuit according to the result of the comparison is
It is no short circuit overcurrent phenomenon occur, since Hall current sensor can both measure exchange, direct current can also be measured, therefore both can be with
The exchange input side of power factor correction module is set, the DC output side in power factor correction module also can be set.
In addition, detecting input current and/or output electric current by setting Hall current sensor, additionally it is possible to save sampling electricity
The setting of resistance, equally can be because of the energy consumption for reducing resistance, to achieve the purpose that reduce power consumption.
In any of the above-described embodiment, optionally, further includes: reactor L1 is set to the PFC mould
Between block and AC power source；Zero crossing detection module 50 is arranged between the end firewire L of the AC power source and zero curve N-terminal, and even
It is connected to the control module 30, the zero crossing detection module 50 is used to acquire the mistake between the end the firewire L and the zero curve N-terminal
Zero detection signal；The control module 30 is also used to: being determined according to the zero passage detection signal of the zero crossing detection module 50 output
The phase state of the AC power source, with according to the phase state to the switch drive module output switch control signal,
It is charged with control to the reactor L1, wherein the AC power source is for exporting the power supply signal.
In this embodiment by reactor L1 is arranged in the ac input end of power factor correction module 10 with exchange
Between power supply, when AC power source carries out exchange output, the electric energy supplied from AC power source can be converted to magnetic by reactor L1
Can be using as energy stores, and the boosting of pfc circuit and the improvement of power factor can be realized by discharging the energy.
Specifically, by the way that zero crossing detection module 50 is arranged between firewire L and zero curve N, to be sentenced by zero crossing detection module 50
The real-time phase of disconnected AC power source, so as to according to switch different in different phase state driving power factor correcting modules 10
Device executes switch operation, to realize rectification function or PFC (PFC) function respectively, thus real based on rectification function
The direct current supply of existing load end, or controlled by PFC, make to exchange side voltage and ac-side current reaches consistent in phase.
In addition, there are many reason of generating over-current phenomenon avoidance, for example circuit is interfered and causes 30 crash reset of control module, or
Short circuit exception etc. occurs for person's reactor L1.
In any of the above-described embodiment, optionally, the power factor correction module 10 is by first switch tube Q1, second
Switching tube Q2, third switching tube Q3 construct to be formed with the 4th switching tube Q4, and first switch tube Q1 is set to second switch Q2
The top of power factor correction module 10, third switching tube Q3 and the 4th switching tube Q4 are set to power factor correction module 10
Lower part, first switch tube Q1 and third switching tube Q3 are set to the left part of power factor correction module 10, second switch Q2 with
4th switching tube Q4 is set to the right part of power factor correction module 10, the first switch tube Q1, the second switch Q2,
The included freewheeling diode of the third switching tube Q3 and the 4th switching tube Q4, by the drain electrode of the first switch tube Q1 with
The drain series of the second switch Q2, and tie point is determined as to the cathode output end of the direct current output, by described
The source electrode of three switching tube Q3 and the source series of the 4th switching tube Q4, and the cathode that tie point is determined as the direct current output is defeated
Outlet, and be grounded, by the drain series of the source electrode of the first switch tube Q1 and the third switching tube Q3, and tie point is connected
It is connected to the end the firewire L, by the drain series of the source electrode of the second switch Q2 and the 4th switching tube Q4, and will connection
Point is connected to the zero curve N-terminal.
In any of the above-described embodiment, optionally, the switch drive module includes for driving the first switch
The first switch drive module 202 of pipe Q1 and the third switching tube Q3, and for driving the second switch Q2 and institute
State the second switch drive module 204 of the 4th switching tube Q4.
In this embodiment, switch drive module includes first switch drive module 202 and second switch drive module
204, to realize the half-bridge driven of H bridge reorganizer.
In any of the above-described embodiment, optionally, further includes: bus capacitor E is connected to the PFC mould
The DC output end of block 10, and be arranged in parallel with the motor drive module 60.
Example IV
As shown in Fig. 2, optionally, the Hall current sensor includes being arranged in institute in any of the above-described embodiment
State the first Hall current sensor 404 between AC power source and the reactor L1, first Hall current sensor 404
End voltage is exchanged for acquiring；The driving protection location 402 is also used to: if detecting, the exchange end voltage is greater than the first peace
Full threshold value then exports the protection signal to the control module 30, to close the output of the switch drive module.
Wherein, the first Hall current sensor 404 can be placed in any of reactor L1 concatenated firewire L or zero curve N
Position.
In this embodiment, the first Hall current is arranged by the ac input end in power factor correction module 10 to sense
No matter device 404 is executing rectifying operation or PFC operation, is having electric current to flow through the first work sensor, thus
When having detected that electric current flows through hall device, which will export corresponding voltage, according to power factor correction module 10
The current value that four switching tubes are able to bear, in the overcurrent built in driving protection location 402 or the first Hall current sensor 404
Setting needs voltage value to be protected in detection unit, first switch tube Q1 in second switch Q2 be connected on firewire L in zero curve N it
Between, third switching tube Q3 is connected on firewire L between zero curve N in the 4th switching tube Q4, when first switch tube Q1- second switch
When abnormal overcurrent occurs in Q2 or the 4th switching tube Q4 of third switching tube Q3-, which will be exported by Hall current sensor
Relevant voltage simultaneously triggers driving protection location 402, and then turns off the switching signal of switch drive module, to protect realization split
The overcurrent for closing pipe drives control of the protection location 402 by releasing to excess flow switch drive module, when overcurrent signal relief with extensive
It is multiple to work normally, so that event higher to likelihood ratio can be achieved during rectifying operation or during PFC
The timely and effectively detection of barrier, to achieve the purpose that promote the safety of entire pfc circuit.
Embodiment five
As shown in Fig. 2, optionally, the Hall current sensor further includes that setting exists in any of the above-described embodiment
Second Hall current sensor 406 of the cathode output end of the direct current output, second Hall current sensor 406 are used for
Acquire the DC terminal voltage of the power factor correction module 10；The driving protection location 402 is also used to: if detecting described
DC terminal voltage is greater than the second secure threshold, then the protection signal is exported to the control module 30, to close the switch
The output of drive module.
In this embodiment, on the basis of the first Hall current sensor 404 are set, increase by second in DC output end
Hall current sensor 406, to acquire the DC bus current of outlet side, thus passing through power factor correction module 10 backward
The load at end carries out in direct current input process, and whether the switching tube that can effectively detect excessively in power factor correction module 10 occurred
Flow phenomenon.
Wherein, the second Hall sensor can be placed on drain electrode that first switch tube Q1 is connected with second switch Q2 with after
Grade load between, that is, be arranged between the anode of direct current output and motor drive module 60, or third switching tube Q3 with
Between 4th switching tube Q4 connected source electrode and successive load, that is, the second output terminal and motor driven mould of direct current output are set
Between block 60.
Specifically, the first Hall current sensor 404 is connected with the voltage output signal of the second Hall current sensor 406
To driving protection location 402, when driving protection location 402 detects the first Hall current sensor 404 and the second Hall current
The voltage signal that sensor 406 exports will be forced shutdown switch drive module beyond preset value, so that realization be protected to open four
Close the defencive function of pipe.Wherein the first Hall current sensor 404 is to protect and work as first switch tube Q1 and second switch
Detection when detection or third switching tube Q3 and the 4th switching tube Q4 when short circuit exception occurs for Q2 occur short-circuit abnormal, the
Detection when two Hall current sensors 406 are to protect first switch tube Q1 and the 4th switching tube Q4 that short circuit exception occurs,
Or detection when second switch Q2 and third switching tube Q3 generation short circuit exception.
Wherein, those skilled in the art can understand that, any one of two Hall current sensors output electricity
Trigger protection unit is all acted beyond the preset value of MOS driving protection location 402 and turns off two MOS driving units by pressure signal
Signal, two priority are identical.Over-current signal is fed back to MCU simultaneously after triggering by the protection location 402 of MOS driving simultaneously, is led to
Know that MCU shutdown switch signal exports.
Specifically, first switch tube Q1, second switch Q2, third switching tube Q3 and the 4th switching tube Q4 all can be
MOSFET (Metal-Oxide-Semiconductor Field-Effect TransIstor, metal oxide semiconductcor field effect
Answer transistor, i.e. metal-oxide-semiconductor), such as super node MOSFET or SiC-MOSFET.
The working method of metal-oxide-semiconductor, controls on-off between source electrode and drain electrode by grid and realizes and switch, and when conducting needs grid
Power supply is greater than source electrode power supply.
Optionally, the source electrode of first switch tube Q1 is electrically connected with the drain electrode of third switching tube Q3, and tie point is via reactance
Device L1 is electrically connected with AC power source, and the source electrode of second switch Q2 is electrically connected with the drain electrode of the 4th switching tube Q4, tie point with
AC power source electrical connection, the drain electrode of first switch tube Q1 are electrically connected with the drain electrode of second switch Q2, tie point and bus electricity
Hold the anode electrical connection of E；The source electrode of third switching tube Q3 is electrically connected with the source electrode of the 4th switching tube Q4, tie point and bus electricity
Hold the cathode electrical connection of E.
Embodiment six
In any of the above-described embodiment, optionally, the control module 30 is also used to: if the input of the AC power source
Voltage is in positive half cycle, then controls the switch drive module output for making the first switch tube Q1 and the 4th switch
The switching signal of pipe Q4 conducting, and bypass corresponding freewheeling diode；The control module 30 is also used to: if the AC power source
Input voltage be in negative half period, then control switch drive module output for making the second switch Q2 and described the
The switching signal of three switching tube Q3 conducting, and corresponding freewheeling diode is bypassed, to realize synchronous rectification.
Wherein, there is freewheeling diode in the inside of first switch tube Q1, freewheeling diode is in first switch tube Q1
The part of existing PN junction between source electrode and drain electrode, the saturation voltage of first switch tube Q1 is (between the drain-source under on-state
Voltage) lower than the positive voltage drop of freewheeling diode.Flowed through in the source drain of first switch tube 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 connecting
Electric current is flowed through in the first switch tube Q1 of state and flows through electricity in the freewheeling diode in the first switch tube Q1 of off-state
Stream is compared, and conduction losses is made to become smaller, in addition, for other second switch Q2, third switching tube Q3 and the 4th switching tube Q4
It is also suitable.
In this embodiment, by the principle using metal-oxide-semiconductor low conduction voltage drop, phase is opened according to the phase state of alternating current
Low-power consumption synchronous rectification can be realized in the metal-oxide-semiconductor answered.
It is answered specifically, the current alternating current phases that control module 30 is detected according to zero crossing detection module 50 carry out output phase
Control signal, drive corresponding switching tube to work.
In the related technology, when synchronizing rectification, in AC power source positive half cycle, electric current is passed by the first Hall current
Then sensor 404 and reactor L1 supply system in the freewheeling diode rectification of the 4th switching tube Q4 by first switch tube Q1
Electricity causes energy waste at this time since freewheeling diode pressure drop is larger.
In this embodiment, control module 30 judges to open in the positive half cycle of AC power source according to zero crossing detection module 50 at this time
When the beginning, electric current passes through the first Hall current sensor 404 and reactor L1, and output switching signal drives first switch tube Q1 and the
Four switching tube Q4 conducting makes to flow through first switch tube Q1, afterflow two on the second Hall current sensor 406 and the 4th switching tube Q4
The electric current of pole pipe flows through metal-oxide-semiconductor, using the low on state characteristic of metal-oxide-semiconductor, freewheeling diode is bypassed, to reduce conduction loss.Together
In AC power source negative half period, control module 30 then controls and opens second switch Q2 and third switching tube Q3 reason, makes four MOS
Pipe realizes synchronous rectification, during synchronous rectification, by by the first Hall current sensor 404 and the second Hall
Current detecting on current sensor 406, detects whether over-current phenomenon avoidance occur.
Embodiment seven
In any of the above-described embodiment, optionally, the control module 30 is also used to: if the input of the AC power source
Voltage is in positive half cycle, then according to the zero passage detection signal and the switching signal control the third switching tube Q3 with it is described
4th switching tube Q4 opening and closing, the third switching tube Q3 is connected with the 4th switching tube Q4, to fill to the reactor
Electricity, turns off the third switching tube Q3 and the 4th switching tube Q4, the first switch tube Q1 conducting, the reactor L1 to
Load supplying；
The control module is also used to: if the input voltage of the AC power source is in negative half period, according to the zero passage
It detects signal and the switching signal controls the third switching tube Q3 and the 4th switching tube Q4 and is opened and closed, the third switch
Pipe Q3 is connected with the 4th switching tube Q4, to charge to the reactor L1, turns off the third switching tube Q3 and institute
The 4th switching tube Q4 is stated, drives the second switch Q2 to be connected, the reactor L1 powers to the load, to realize power factor
Correction.
In this embodiment, in circuit for when input is in the positive half cycle of AC power source, controlling when carrying out PFC operation
Molding block 30 drives third switching tube Q3 to be connected with the 4th switching tube Q4, fills to reactor L1 according to zero passage detection signal
Electricity, when turning off third switching tube Q3 and the 4th switching tube Q4, control module 30 drives first switch tube Q1 to open, reactor L1
The electric energy of storage will be released to late-class circuit by first switch tube Q1, power to bus capacitor E and load (such as motor),
When input is in the negative half period of AC power source, control module 30 drives third switching tube Q3 and the 4th according to zero passage detection signal
Switching tube Q4 conducting, charges to reactor L1, when turning off third switching tube Q3 and the 4th switching tube Q4, control module 30
Second switch Q2 is driven to open, the electric energy of reactor L1 storage will be released to late-class circuit by second switch Q2, to mother
Line capacitance E and load (such as motor) power supply, by discharging the energy put aside in reactor L1 to bus capacitor E, to bus
The DC voltage of capacitor E boosts, so as to reduce the distortion of current waveform, connect current waveform by short circuit current
Nearly sine wave, and then the power factor of pfc circuit can be improved, further, by calculating the according to the busbar voltage of load
The pulsewidth of three switching tube Q3 or first switch tube Q1, can reasonably adjust the duration of pfc circuit short circuit currents, according to arteries and veins
The number that change frequency rationally controls each switch conduction/shutdown is rushed, can reduce the conduction losses of switch unit, reduces switch
Loss, improves efficiency.
In any of the above-described embodiment, optionally, further includes: motor drive module 60 is connected to the power factor
The DC output end of correction module 10, for receiving the direct current output of the power factor correction module 10, to load supplying；
DC bus-bar voltage detection module (not shown) is connected to the DC output end of the power factor correction module 10, and
It is arranged in parallel with the motor drive module 60, for detecting DC bus-bar voltage.
In this embodiment, in the application scenarios that load is motor, motor drive module 60 is used for constant voltage DC is inverse
Become three-phase alternating current output, powered with realizing to motor, in conjunction with the setting of DC bus-bar voltage detection module, by power because
The detection of the busbar voltage of the direct current output of number correction module 10 and the detection of the input voltage, control PFC
Pulsewidth in module 10 when switch state and each switching tube conducting of each switching tube member.
In any of the above-described embodiment, optionally, the control module 30 is additionally coupled to the connection of motor drive module 60,
For exporting inverter control signal to the motor drive module 60.
The air conditioner of embodiment according to the present utility model, comprising: power factor school described in any of the above-described embodiment
Positive circuit.
Compared with prior art, embodiment disclosed in technical scheme at least have it is following the utility model has the advantages that
(1) since Hall current sensor is not in electrical contact with circuit-under-test, the power of tested power supply can not be consumed,
Therefore the efficient low power consumption control of frequency conversion equipment is not influenced.
(2) since Hall current sensor directly acquires the input terminal electric current and/or output end of power factor correction module
Electric current makes power factor correction module corresponding different current flow paths when executing different feature operations that can pass through Hall
Current sensor carries out circuit abnormality detection, therefore can more directly detect whether rectifier exception, Yi Ji occurs
When determining that appearance is abnormal, corresponding exceptional part can determine under different operating conditions, middle use has compared with the existing technology
The driving chip combination sampling resistor of defencive function carries out the scheme of over-current detection, and limitation is smaller, and more has and be directed to
Property and practicability.
(3) input current and/or output electric current are detected by setting Hall current sensor, additionally it is possible to save sampling resistor
Setting, equally can be because of the energy consumption for reducing resistance, to achieve the purpose that reduce power consumption.
The voltage output signal of (4) first Hall current sensors and the second Hall current sensor is connected to driving protection
Unit, when driving protection location detects the voltage signal of the first Hall current sensor and the output of the second Hall current sensor
It will be forced shutdown switch drive module beyond preset value, to protect the defencive function realized to four switching tubes.Wherein first
Hall current sensor is to protect detection or third when short circuit exception occurs for first switch tube and second switch
Detection when short circuit exception occurs for switching tube and the 4th switching tube, and the second Hall current sensor is to protect first switch tube
Inspection when detection or second switch and third switching tube when short circuit exception occurs with the 4th switching tube occur short-circuit abnormal
Survey, compared with the existing technology in can only realize above and below Q1 and Q3 there is inspection when abnormal or upper and lower Q2 and Q4 occurs abnormal
Survey scheme, practicability are stronger.
The technical solution of the utility model is had been described in detail above with reference to the accompanying drawings, by the technical solution of the utility model,
In the ac input end and/or DC output end of power factor correction module, Hall current sensor, Hall current sensing are set
Position of the device based on setting acquires the input current of power factor correction module, or output electric current, and converts electrical current into voltage
On signal output driving protection location, to detect whether occurring over-current phenomenon avoidance by driving protection location, to detect occurring
In the case where flow phenomenon, control stops to power factor correction module output switching signal, on the one hand, since Hall current senses
Device is not in electrical contact with circuit-under-test, can not consume the power of tested power supply, therefore does not influence the efficient low of frequency conversion equipment
Power consumption control, on the other hand, due to Hall current sensor directly acquire power factor correction module input terminal electric current and/or
Output end current lead to power factor correction module corresponding different current flow paths when executing different feature operations can
It crosses Hall current sensor and carries out circuit abnormality detection, therefore can more directly detect whether rectifier exception occurs,
And determine occur abnormal when, can determine corresponding exceptional part under different operating conditions, compared with the existing technology in adopt
The scheme of over-current detection is carried out with the driving chip combination sampling resistor with defencive function, limitation is smaller, and more has
Targetedly and practicability.
It should be understood by those skilled in the art that, the embodiments of the present invention can provide as method, system or computer
Program product.Therefore, the utility model can be used complete hardware embodiment, complete software embodiment or combine software and hardware
The form of the embodiment of aspect.Moreover, it wherein includes computer available programs that the utility model, which can be used in one or more,
Implement in the computer-usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) of code
The form of computer program product.
The utility model is produced referring to according to the method, equipment (system) and computer program of the utility model embodiment
The flowchart and/or the block diagrams of product describes.It should be understood that can be realized by computer program instructions in flowchart and/or the block diagram
Each flow and/or block and flowchart and/or the block diagram in process and/or box combination.It can provide these meters
Calculation machine program instruction is to the place of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices
Device is managed to generate a machine, so that producing by the instruction that computer or the processor of other programmable data processing devices execute
Life is for realizing the function of specifying in one or more flows of the flowchart and/or one or more blocks of the block diagram
Device.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
It should be noted that in the claims, any reference symbol between parentheses should not be configured to power
The limitation that benefit requires.Word "comprising" does not exclude the presence of component or step not listed in the claims.Before component
Word "a" or "an" does not exclude the presence of multiple such components.The utility model can be by means of including several difference portions
It the hardware of part and is realized by means of properly programmed computer.If in the module claim for listing equipment for drying, this
Several in devices, which can be, a bit is embodied by the same item of hardware.Word first, second, and third makes
With not indicating any sequence.These words can be construed to title.
Although the preferred embodiment of the utility model has been described, once a person skilled in the art knows basic
Creative concept, then additional changes and modifications may be made to these embodiments.It is wrapped so the following claims are intended to be interpreted as
It includes preferred embodiment and falls into all change and modification of the scope of the utility model.
Obviously, it is practical without departing from this can to carry out various modification and variations to the utility model by those skilled in the art
Within the scope of novel claim and its equivalent technologies, then the utility model is also intended to include these modifications and variations.
Claims (11)
1. a kind of circuit of power factor correction characterized by comprising
Power factor correction module receives power supply signal, and the power factor correction module includes switching tube, the switching tube quilt
It is configured to control the power supply signal to load supplying；
Switch drive module is connected to the driving input terminal of the switching tube, is used for the switch plumber block output switching signal；
Control module is connected to the switch drive module, opens the output switch for controlling the switch drive module
Signal closes the output switching signal；
Overcurrent protection module is connect with the control module, and the overcurrent protection module includes for acquiring the power factor
The input current and/or output electric current of correction module, and it is changed into the current sensor of sampled signal, sampled signal is if more than peace
Full threshold value, Xiang Suoshu control module output protection signal, the protection signal are opened described in the control module closing for triggering
Close the output of drive module.
2. circuit of power factor correction according to claim 1, which is characterized in that
Over-current protecting unit built in the current sensor forms the overcurrent protection module with construction.
3. circuit of power factor correction according to claim 1, which is characterized in that the overcurrent protection module further include:
Protection location is driven, is connect with the current sensor and the control module, is used in sampled signal if more than institute
In the case where stating secure threshold, Xiang Suoshu control module output protection signal, the protection signal is for triggering the control mould
Block closes the output of the switch drive module.
4. circuit of power factor correction according to claim 3, which is characterized in that further include:
Reactor is set between the power factor correction module and AC power source；
Zero crossing detection module is arranged between the zero line and zero line side of the AC power source, and is connected to the control module,
The zero crossing detection module is used to acquire the zero passage detection signal between the zero line and the zero line side；
The control module is also used to: determining the AC power source according to the zero passage detection signal that the zero crossing detection module exports
Phase state, with according to the phase state to the switch drive module output switch control signal, to control to described
Reactor carries out charging or reactor electric discharge,
Wherein, the AC power source is for exporting the power supply signal.
5. circuit of power factor correction according to claim 4, which is characterized in that
The current sensor includes the first Hall current sensor being arranged between the AC power source and the reactor,
First Hall current sensor is for acquiring exchange end voltage；
The driving protection location is also used to: if detecting, the exchange end voltage is greater than the first secure threshold, to the control
Molding block exports the protection signal, to close the output of the switch drive module.
6. circuit of power factor correction according to claim 5, which is characterized in that
The current sensor further includes the second Hall current sensor that the cathode output end of the direct current output is arranged in, institute
The second Hall current sensor is stated for acquiring the output end voltage of the power factor correction module；
The driving protection location is also used to: if detecting, the DC terminal voltage is greater than the second secure threshold, to the control
Molding block exports the protection signal, to close the output of the switch drive module.
7. circuit of power factor correction according to claim 6, which is characterized in that
The power factor correction module constructs shape by first switch tube, second switch, third switching tube and the 4th switching tube
At included two pole of afterflow of the first switch tube, the second switch, the third switching tube and the 4th switching tube
Tie point by the drain electrode of the first switch tube and the drain series of the second switch, and is determined as the direct current by pipe
The cathode output end of output is determined by the source series of the source electrode of the third switching tube and the 4th switching tube, and by tie point
It for the cathode output end of the direct current output, and is grounded, by the leakage of the source electrode of the first switch tube and the third switching tube
Pole series connection, and tie point is connected to the zero line, by the leakage of the source electrode of the second switch and the 4th switching tube
Pole series connection, and tie point is connected to the zero line side；
The control module is also used to: if the input voltage of the AC power source is in positive half cycle, controlling the switch driving
Module exports the switching signal for the first switch tube to be connected with the 4th switching tube, and bypasses corresponding afterflow two
Pole pipe；
The control module is also used to: if the input voltage of the AC power source is in negative half period, controlling the switch driving
Module exports the switching signal for the second switch to be connected with the third switching tube, and bypasses corresponding afterflow two
Pole pipe, to realize synchronous rectification.
8. circuit of power factor correction according to claim 7, which is characterized in that
The switch drive module includes for driving the first switch of the first switch tube and the third switching tube to drive
Module, and the second switch drive module for driving the second switch Yu the 4th switching tube.
9. circuit of power factor correction according to claim 7, which is characterized in that
The control module is also used to: if the input voltage of the AC power source is in positive half cycle, according to the zero passage detection
Signal and the switching signal control the third switching tube and the 4th switching tube is opened and closed, the third switching tube with it is described
The conducting of 4th switching tube, to charge to the reactor, turns off the third switching tube and the 4th switching tube, described
First switch tube conducting, the reactor power to the load；
The control module is also used to: if the input voltage of the AC power source is in negative half period, according to the zero passage detection
Signal and the switching signal control the third switching tube and the 4th switching tube is opened and closed, the third switching tube with it is described
The conducting of 4th switching tube, to charge to the reactor, turns off the third switching tube and the 4th switching tube, drives
The second switch conducting, the reactor powers to the load, to realize PFC.
10. the circuit of power factor correction according to any one of claim 4 to 9, which is characterized in that further include:
Motor drive module is connected to the DC output end of the power factor correction module, for receiving the power factor
The direct current output of correction module, to load supplying；
DC bus-bar voltage detection module, be set to the power factor correction module cathode output end and cathode output end it
Between, for detecting the busbar voltage of the direct current output；
Bus capacitor is set between the cathode output end and cathode output end of the power factor correction module, described
Reactor charges when discharging；
The control module is additionally coupled to motor drive module connection, for exporting inversion control to the motor drive module
Signal.
11. a kind of air conditioner characterized by comprising the PFC electricity as described in any one of claims 1 to 10
Road.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920713117.2U CN209545435U (en) | 2019-05-17 | 2019-05-17 | Circuit of power factor correction and air conditioner |
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| CN201920713117.2U CN209545435U (en) | 2019-05-17 | 2019-05-17 | Circuit of power factor correction and air conditioner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020232995A1 (en) * | 2019-05-17 | 2020-11-26 | 广东美的制冷设备有限公司 | Power factor correction circuit and air conditioner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020232995A1 (en) * | 2019-05-17 | 2020-11-26 | 广东美的制冷设备有限公司 | Power factor correction circuit and air conditioner |
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