CN110224584A - Household appliance and its passive power factor correcting circuit - Google Patents
Household appliance and its passive power factor correcting circuit Download PDFInfo
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- CN110224584A CN110224584A CN201910594782.9A CN201910594782A CN110224584A CN 110224584 A CN110224584 A CN 110224584A CN 201910594782 A CN201910594782 A CN 201910594782A CN 110224584 A CN110224584 A CN 110224584A
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- capacitive element
- power factor
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- correcting circuit
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- 238000004146 energy storage Methods 0.000 claims abstract description 51
- 230000005611 electricity Effects 0.000 claims description 15
- 239000000428 dust Substances 0.000 claims description 5
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- 238000005516 engineering process Methods 0.000 description 14
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Classifications
-
- 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
- H02M1/4266—Arrangements for improving power factor of AC input using passive elements
-
- 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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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Abstract
The present invention provides a kind of passive power factor correcting circuit and configure the household appliance of the circuit, wherein, passive power factor correcting circuit includes: the energy storage inductor of series connection, the first capacitive element, first diode and the second capacitive element, energy storage inductor is connected to the anode of the first capacitive element, the cathode of first capacitive element is connected to the anode of first diode, and the anode of the second capacitive element is connected to the cathode of first diode；Second diode, the anode of the second diode are connected to the anode of the second capacitive element, and the cathode of the second diode is connected between energy storage inductor and the first capacitive element；Third diode, the anode of third diode are connected to the cathode of the second capacitive element, and the cathode of third diode is connected between the first capacitive element and first diode.The passive power factor correcting circuit that the application limits can use small-sized inductance or capacitor, realize the miniaturization setting of entire circuit.
Description
Technical field
The present invention relates to drive control circuit fields, in particular to a kind of household appliance and its passive power factor
Correcting circuit.
Background technique
Currently, PFC (PFC, Power can be arranged in household appliance, such as air conditioner, refrigerator etc.
Factor Correction, PFC) circuit, passive power factor correcting circuit refers to active without using transistor etc.
The correcting circuit of device composition, the mode which generallys use inductance compensation carrys out increase power factor, cause to exist with
Lower defect:
By the way that the inductance and bulky capacitor capacity with big inductance quantity is arranged, as shown in Figure 1, obtaining relatively good filtering effect
Fruit causes the volume of product to increase and increase accordingly with cost.
Summary of the invention
The present invention is directed to solve at least one of the technical problems existing in the prior art or related technologies.
For this purpose, an object of the present invention is to provide a kind of passive power factor correcting circuits.
It is another object of the present invention to propose a kind of household electrical appliances for configuring above-mentioned passive power factor correcting circuit to set
It is standby.
In the technical solution of the first aspect of the present invention, a kind of passive power factor correcting circuit is provided, comprising: supply
Electric module and power factor correction module, the power supply module are used for output ripple direct current signal, the PFC mould
Block, for carrying out PFC to the pulsating direct current signal, the power factor correction module includes: series connection
Energy storage inductor, the first capacitive element, first switch device and the second capacitive element, the energy storage inductor, which is connected to described first, to be held
Property element anode, the cathode of first capacitive element is connected to the input stage of the first switch device, and described second holds
The anode of property element is connected to the output stage of the first switch device；Second switch device, the second switch device it is defeated
Enter the input stage that grade is connected to second capacitive element, the output stage of the second switch device is connected to the energy storage inductor
Between first capacitive element；Third switching device, the input stage of the third switching device are connected to described second and hold
The cathode of property element, the output stage of the third switching device are connected to first capacitive element and the first switch device
Between, wherein the second switch device and the third switch device conductive, the first switch device cut-off, described the
One capacitive element and the second capacitive element discharge, the first switch break-over of device, the second switch device and the third
Switching device cut-off charges to first capacitive element and second capacitive element by the pulsating direct current signal.
Passive power factor correcting circuit according to the present invention is replaced in the prior art using two independent capacitive elements
Big electrolytic capacitor, cooperate increased first switch device, second switch device and third switching device, if power supply module
Output voltage is respectively smaller than the voltage at the first capacitive element both ends and the voltage at the second capacitive element both ends, second opens at this time
Break-over of device is closed, the anode of the second capacitive element is powered by second switch device to the high voltage input terminal of load, and the
The anode of one capacitive element, can also be directly to load supplying, to make third switch device conductive as high voltage bus end, this
When first switch device end, the first capacitive element and the second capacitive element form parallel relationship, capacitor and energy storage after parallel connection
Be in open-circuit condition between inductance, and the capacitance after parallel connection be the first capacitive element and the second capacitive element capacity it
With, guarantee to load supplying ability while, using capacitance and the smaller capacitive element of resistance to pressure, single capacitor can be reduced
Capacity and volume, realize optimization to entire power factor correction module.
Further, first switch device is set between the first capacitive element and the second capacitive element, by increasing by the
One switching device, on the one hand, it can guarantee reliability when the first capacitive element and the second capacitive element discharge to loaded work piece,
On the other hand, when the output voltage of power supply module is greater than the voltage on capacitive element, by power supply module to energy storage inductor, the
One capacitive element, the charging of the second capacitive element, and realize to load supplying, at this point, second switch device and third switching device
In off state, first switch device is in the conductive state, is formed and is connected between the first capacitive element and the second capacitive element
Relationship has between the capacity C 1 of capacity C and the first capacitive element and the capacity C 2 of the second capacitive element after series connection as follows
Relationship:
I.e.
Capacitance after connecting reduces, and since capacitance reduces, corresponding charging current also reduces, on the one hand,
Under the premise of not influencing energy storage inductor charged state, in passive power factor correcting circuit in this application, it can use
The energy storage inductor of more small inductor amount replaces the energy storage inductor on circuit in the related technology, thus realize the reduction of inductance volume,
In conjunction with the first capacitive element and the second capacitive element equally minimized, achieve the purpose that entire circuit miniaturization setting.
On the other hand, if be arranged with energy storage inductor using identical specification with capacitive element in the related technology, by
In adaptation variation of the inductive capacity under different operating conditions, then it can be realized better filter effect and PFC effect.
In addition, by concatenated first capacitive element and the charging of the second capacitive element, additionally it is possible to prevent through energy storage electricity
Magnetic saturation phenomenon caused by electric current in sense is excessive, and then be conducive to be promoted the safety of entire circuit operation.
In the above-mentioned technical solutions, optionally, switching device is diode or switching tube, wherein by the diode
Anode is determined as the input stage, and the cathode of the diode is determined as the output stage.
Wherein, switching tube is specifically as follows IGBT type power tube and MOSFET, the MOSFET include SiC-MOSFET with
GaN-MOSFET。
Switching tube realizes conducting by receiving control signal.
Its specifically, by taking diode as an example, power supply module and power factor correction module, the power supply module is for exporting
Pulsating direct current signal, the power factor correction module are described for carrying out PFC to the pulsating direct current signal
Power factor correction module includes: the energy storage inductor of series connection, the first capacitive element, first diode and the second capacitive member
Part, the energy storage inductor are connected to the anode of first capacitive element, and the cathode of first capacitive element is connected to described
The anode of the anode of first diode, second capacitive element is connected to the cathode of the first diode；Second diode,
The anode of second diode is connected to the anode of second capacitive element, and the cathode of second diode is connected to institute
It states between energy storage inductor and first capacitive element；Third diode, the anode of the third diode are connected to described
The cathode of two capacitive elements, the cathode of the third diode be connected to first capacitive element and the first diode it
Between, wherein second diode and the third diode current flow, the first diode cut-off, the first capacitive member
Part and the second capacitive element discharge, and the first diode conducting, second diode and the third diode end, lead to
The pulsating direct current signal is crossed to charge to first capacitive element and second capacitive element.
Passive power factor correcting circuit according to the present invention is replaced in the prior art using two independent capacitive elements
Big electrolytic capacitor, cooperate increased first diode, the second diode and third diode, if power supply module output electricity
Pressure is respectively smaller than the voltage at the first capacitive element both ends and the voltage at the second capacitive element both ends, and the second diode is led at this time
Logical, the anode of the second capacitive element is powered by the second diode to the high voltage input terminal of load, and the first capacitive element
Anode as high voltage bus end, can also be directly to load supplying, to make third diode current flow, first diode at this time
Cut-off, the first capacitive element and the second capacitive element form parallel relationship, are in and open between the capacitor and energy storage inductor after parallel connection
Line state, and the capacitance after parallel connection is the sum of the first capacitive element and the capacity of the second capacitive element, is being guaranteed to load
While power supply capacity, using capacitance and the smaller capacitive element of resistance to pressure, the capacity and volume of single capacitor can be reduced, it is real
Now to the optimization of entire power factor correction module.
Further, first diode is set between the first capacitive element and the second capacitive element, by increasing by first
Diode, on the one hand, it can guarantee reliability when the first capacitive element and the second capacitive element discharge to loaded work piece, it is another
Aspect holds energy storage inductor, first by power supply module when the output voltage of power supply module is greater than the voltage on capacitive element
Property element, the charging of the second capacitive element, and realize to load supplying, at this point, the second diode and third diode are in cut-off
State, first diode is in the conductive state, series relationship is formed between the first capacitive element and the second capacitive element, after series connection
Capacity C and the first capacitive element capacity C 1 and the second capacitive element capacity C 2 between have following relationship:
I.e.
Capacitance after connecting reduces, and since capacitance reduces, corresponding charging current also reduces, on the one hand,
Under the premise of not influencing energy storage inductor charged state, in passive power factor correcting circuit in this application, it can use
The energy storage inductor of more small inductor amount replaces the energy storage inductor on circuit in the related technology, thus realize the reduction of inductance volume,
In conjunction with the first capacitive element and the second capacitive element equally minimized, achieve the purpose that entire circuit miniaturization setting.
On the other hand, if be arranged with energy storage inductor using identical specification with capacitive element in the related technology, by
In adaptation variation of the inductive capacity under different operating conditions, then it can be realized better filter effect and PFC effect.
In addition, by concatenated first capacitive element and the charging of the second capacitive element, additionally it is possible to prevent through energy storage electricity
Magnetic saturation phenomenon caused by electric current in sense is excessive, and then be conducive to be promoted the safety of entire circuit operation.
Passive power factor correcting circuit described in above-mentioned technical proposal according to the present invention can also have following additional
Technical characteristic:
In the above-mentioned technical solutions, optionally, first capacitive element is identical as the capacity of second capacitive element.
In the technical scheme, hold by using the first capacitive element of same size and the second capacitive element, i.e., first
Property element it is identical as the capacity of the second capacitive element (C1=C2), to the first capacitive element and the second capacitive element charging when,
First capacitive element is equivalent to the second capacitive element and connects, the capacitance C=C1/2 after series connection, the first capacitive element with
When second capacitive element discharges, the first capacitive element is equivalent to capacitance C=2* in parallel, after parallel connection with the second capacitive element
C1, the setting of the capacitive element of two identical capacity, on the one hand, keep the process of preparation simpler, on the other hand, make power factor
The reliability of correction course is higher, in another aspect, can reduce charging current in charging, to use the lesser electricity of inductance
Sense can guarantee small dimension capacitor in parallel to the power supply capacity of load in electric discharge.
In any of the above-described technical solution, optionally, the first capacitive member is determined according to supply current needed for load
The capacity of the capacity of part and second capacitive element.
In the technical scheme, by determining the capacity of capacitive element according to power supply circuit needed for load, to meet
When uncontrollable rectifier module can not be powered load, meet capacitive element to the power demands of load.
In any of the above-described technical solution, optionally, according to first capacitive element and second capacitive element
Charging current is allowed to determine the inductance of the energy storage inductor.
In the technical scheme, energy storage inductor passes through the charging current progress type selecting flowed through, therefore is using concatenated appearance
Property element when single capacitive element being replaced to receive charging signals, required charging current reduces, therefore the electricity of required energy storage inductor
Sensibility reciprocal also reduces, it is thus determined that the energy storage inductor used can have smaller volume and lower cost.
In the technical scheme, electric current when powering load is depended on due to the capacitance of capacitor, when needing phase in load
In the case where with electric current, passive power factor correcting circuit provided by the present application is compared to passive power factor in the related technology
A case where capacitive element is provided only in correcting circuit, the capacity of first capacitive element, which can be in traditional circuit, to be held
The half of property element volume, at the same the capacity of the second capacitive element be also possible to capacitive element capacity in traditional circuit half its
Capacitor makes in different working conditions in conjunction with first diode, the one-way conduction characteristic of the second diode and third diode
One capacitive element has different connection relationships from the second capacitive element, and different connection relationships corresponds to different capacitances,
Low capacity can make required inductance smaller, and the power demands to load can be satisfied in large capacity.
In any of the above-described technical solution, optionally, the power supply module includes: power supply, for exporting Alternating Current Power Supply letter
Number；Rectification unit, for the Alternating Current Power Supply signal to be converted to the pulsating direct current signal, wherein the rectification unit
High-voltage output end is connected to the energy storage inductor, and the low-voltage output of the rectification unit is connected to second capacitive element
Cathode.
Wherein, the rectification unit is diode uncontrollable rectifier unit.
Wherein, uncontrollable rectifier unit is the rectification unit that rectification function is realized using diode.
In any above-mentioned technical proposal, optionally, the passive power factor correcting circuit further include: inverter,
The first input end of the inverter is connected to the anode of first capacitive element, the second input terminal connection of the inverter
To the cathode of second capacitive element, the inverter is used for first capacitive element and second capacitive element two
The busbar voltage inversion at end is AC signal, and inputs the load.
In the above-mentioned technical solutions, optionally, if the load includes that single phase ac loads, the inverter includes pair
The single-phase inversion circuit answered, the single-phase inversion circuit include: bridge arm power devices and two lower bridge arm power devices on two,
It accesses between the high voltage bus end of the power factor correction module and the low-voltage bus bar end of the power factor correction module, if
The load includes that three-phase alternating current loads, then the inverter includes corresponding three-phase inverting circuit, the three-phase inverting circuit
Include: three upper bridge arm power devices and three lower bridge arm power devices, accesses the high voltage bus end and the low-voltage bus bar
Between end, wherein the upper bridge arm power device of phase and the lower bridge arm power device series of a corresponding phase
Connection connects, and the upper bridge arm power device and the lower bridge arm power device of same phase do not simultaneously turn on.
In the technical scheme, it if load includes single phase ac load, is provided in inverter corresponding single-phase
Inverter circuit, to export corresponding driving signal to single phase ac load.Specifically, single phase ac load can be single-phase electricity
Machine is also possible to single-phase inductive load.
Wherein, single-phase inversion circuit includes two upper bridge arm power devices and two lower bridge arm power devices, is connected to appearance
Between the deferent segment of property element and the input terminal of load.
If load includes three-phase alternating current load, corresponding three-phase inverting circuit is provided in inverter, with to three
Phase AC load exports corresponding driving signal.Specifically, three-phase alternating current load can be induction machine, and it is same to be also possible to permanent magnetism
Walk motor.
Wherein, three-phase inverting circuit includes three upper bridge arm power devices and three lower bridge arm power devices, is connected to appearance
Between the deferent segment of property element and the input terminal of load.The lower bridge of the upper corresponding phase of bridge arm power device of each phase
The series connection of arm power device, the upper bridge arm power device and lower bridge arm power device of same-phase will not simultaneously turn on, and intersect to three
The load of current load exports a phase driving signal, and the upper bridge arm power device and lower bridge arm power device of three phases are alternately led
Logical, the load loaded to three-phase alternating current exports three-phase driving signal.
In the above-mentioned technical solutions, optionally, first capacitive element includes a capacity cell or multiple capacitors member
Part；Second capacitive element includes a capacity cell or multiple capacity cells, wherein the multiple capacity cell is in parallel
And/or it is arranged in series.
In the above-mentioned technical solutions, optionally, the capacity cell is electrolytic capacitor.
In the technical solution of the second aspect of the present invention, a kind of household appliance, including load and such as present invention are proposed
Passive power factor correcting circuit described in any one of first aspect technical solution, the passive power factor correcting circuit connect
Enter between power supply and the load, the passive power factor correcting circuit is configured as control power supply signal to the load
Power supply.
In a kind of household appliance that the technical solution of the second aspect of the present invention proposes, by setting just like the present invention first
Passive power factor correcting circuit described in any one of aspect technical solution, to have all of the above beneficial effect, herein
It repeats no more.
In above-mentioned technical proposal, the household appliance includes air conditioner, refrigerator, fan, smoke exhaust ventilator, dust catcher and electricity
At least one of brain server.
In the present solution, the household appliance include but is not limited to air conditioner, refrigerator, fan, smoke exhaust ventilator, dust catcher and
One of host computer is a variety of, it is to be understood that above-mentioned electrical equipment can configure passive function provided by the present application
The structure of rate factor correcting circuit reaches the inductance and capacitor using low capacity, achievees the purpose that reduce product cost, or use
The inductance and capacitor of amount of capacity same as the prior art are to reach better filter effect.
Using circuit of power factor correction defined in the application, at least have following technical effect that
(1) electric current when capacitance of capacitor is depending on powering load, the setting side with single capacitive element in the related technology
Formula is compared, if supply current needed for load is identical, the capacity of the first capacitive element and the second capacitive element in parallel is single
The 1/2 of the capacity of capacitive element realizes, volume smaller capacitive element mesh for PFC lower using cost
's.
(2) inductance of energy storage inductor depends on the size of current to charge to capacitive element, and during the charging process, first holds
Property element is connected with the second capacitive element, thus capacitance is smaller, and compared to single capacitor, charging current is smaller, required
Inductance specification is also just lower.
(3) if the first capacitive element is identical as the second capacitive element specification, the maximum voltage at capacitive element both ends is
0.5*UACpeak, wherein UACFor busbar voltage, and single capacitive element is used, the voltage on capacitive element is up to UACpeak, therefore
Capacitive element in the application can have smaller pressure voltage.
(4) since the capacity and pressure voltage of required capacitive element reduce, then the inductance of required energy storage inductor can also
To reduce, to save setup cost, while the volume of inductance and capacitor reduces, and the miniaturization for being also beneficial to entire circuit volume is set
It sets.
(5) in addition, and if single capacitive element in the related technology it is identical as the specification that energy storage inductor uses, and it is related
Passive power factor correcting circuit in technology is compared, and since overall performance improves, can have better filter effect
With power factor correction effect.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, in which:
Fig. 1 shows the structural schematic diagram of passive power factor correcting circuit in the related technology；
Fig. 2 shows passive power factor correcting circuit schematic diagrames according to an embodiment of the invention；
Fig. 3 shows the charging current path of the passive power factor correcting circuit described according to an embodiment of the present invention
Schematic diagram；
Fig. 4 shows the schematic equivalent circuit of the charging of passive power factor correcting circuit described in Fig. 3；
Fig. 5 shows the discharge current access of the passive power factor correcting circuit described according to an embodiment of the present invention
Schematic diagram；
Fig. 6 shows the schematic equivalent circuit of the electric discharge of passive power factor correcting circuit described in Fig. 5；
Fig. 7 shows direct current signal of pulsing in the passive power factor correcting circuit described according to an embodiment of the present invention
Waveform diagram；
Fig. 8 shows the wave of inductive current in the passive power factor correcting circuit described according to an embodiment of the present invention
Shape figure；
Fig. 9 shows the wave of the passive power factor correcting circuit median generatrix voltage described according to an embodiment of the present invention
Shape figure.
Wherein, arrow direction of the Fig. 3 into Fig. 6 indicates current direction.
Specific embodiment
To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawing and specific real
Applying mode, the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application
Feature in example and embodiment can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
To be implemented using other than the one described here other modes, therefore, protection scope of the present invention is not limited to following public affairs
The limitation for the specific embodiment opened.
Passive power factor correcting circuit according to an embodiment of the invention, comprising: power supply module and power factor
Correction module, power supply module are used for output ripple direct current signal, power factor correction module, for carrying out to pulsating direct current signal
PFC, power factor correction module include: the energy storage inductor of series connection, the first capacitive element, first switch device
Part and the second capacitive element, energy storage inductor are connected to the anode of the first capacitive element, and the cathode of the first capacitive element is connected to
The input stage of one switching device, the anode of the second capacitive element are connected to the output stage of first switch device；Second switch device,
The input stage of second switch device is connected to the input stage of the second capacitive element, and the output stage of second switch device is connected to energy storage
Between inductance and the first capacitive element；Third switching device, the input stage of third switching device are connected to the second capacitive element
Cathode, the output stage of third switching device are connected between the first capacitive element and first switch device, wherein second switch device
Part and third switch device conductive, the cut-off of first switch device, the first capacitive element and the second capacitive element discharge, first switch
Break-over of device, second switch device and third switching device end, by pulsating direct current signal to the first capacitive element and second
Capacitive element charging.
Switching device is diode or switching tube, wherein the anode of diode is determined as input stage, by the negative of diode
Pole is determined as output stage.
Wherein, switching tube is specifically as follows IGBT type power tube and MOSFET, and MOSFET includes SiC-MOSFET and GaN-
MOSFET。
Embodiment one
As shown in Fig. 2, passive power factor correction according to another embodiment of the invention is electric by taking diode as an example
Road, comprising: power supply module and power factor correction module, power supply module are used for output ripple direct current signal, PFC
Module, for carrying out PFC to pulsating direct current signal, power factor correction module includes: the energy storage electricity of series connection
Sense L, the first capacitive element C1, first diode D1 and the second capacitive element C2, energy storage inductor L are connected to the first capacitive element C1
Anode, the cathode of the first capacitive element C1 is connected to the anode of first diode D1, the anode connection of the second capacitive element C2
To the cathode of first diode D1；Second diode D2, the anode of the second diode D2 are being connected to the second capacitive element C2 just
Pole, the cathode of the second diode D2 are connected between energy storage inductor L and the first capacitive element C1；Third diode D3, the three or two
The anode of pole pipe D3 is connected to the cathode of the second capacitive element C2, and the cathode of third diode D3 is connected to the first capacitive element C1
Between first diode D1, wherein the second diode D2 is connected with third diode D3, first diode D1 cut-off, and first
Capacitive element C1 and the second capacitive element C2 discharges, and first diode D1 conducting, the second diode D2 and third diode D3 are cut
Only, it is charged by pulsating direct current signal to the first capacitive element C1 and the second capacitive element C2.
Passive power factor correcting circuit according to the present invention is replaced in the prior art using two independent capacitive elements
Big electrolytic capacitor, cooperate increased first diode D1, the second diode D2 and the three the second diode D2, if power supply mould
The output voltage of block is respectively smaller than the voltage at the first both ends capacitive element C1 and the voltage at the second both ends capacitive element C2, this
When the second diode D2 be connected, the anode of the second capacitive element C2 is carried out by the second diode D2 to the high voltage input terminal of load
Power supply, and the anode of the first capacitive element C1 is as high voltage bus end, it can also be directly to load supplying, to make the three or two pole
Pipe D3 conducting, first diode D1 ends at this time, and the first capacitive element C1 and the second capacitive element C2 form parallel relationship, in parallel
Open-circuit condition, first capacitive element C1 the second capacitive element C2 and the electricity after parallel connection are between capacitor and energy storage inductor L afterwards
Hold the sum of the capacity that capacity is the first capacitive element C1 and the second capacitive element C2, while guaranteeing to load supplying ability,
Using capacitance and the smaller capacitive element of resistance to pressure, the capacity and volume of single capacitor can be reduced, realize to entire power because
The optimization of number correction module.
Further, first diode D1 is set between the first capacitive element C1 and the second capacitive element C2, passes through increasing
Add first diode D1, on the one hand, can guarantee when the first capacitive element C1 and the second capacitive element C2 discharges to loaded work piece
Reliability, on the other hand, power supply module output voltage be greater than capacitive element on voltage when, by power supply module to storage
Energy inductance L, the first capacitive element C1, the second capacitive element C2 charging, and realize to load supplying, at this point, the second diode D2
It is in off state with third diode D3, first diode D1 is in the conductive state, the first capacitive element C1 and the second capacitive
Series relationship is formed between element C2, the capacity C 1 and the second capacitive element of the capacity C after series connection and the first capacitive element C1
There is following relationship between the capacity C 2 of C2:
I.e.
Capacitance after connecting reduces, and since capacitance reduces, corresponding charging current also reduces, on the one hand,
Under the premise of not influencing energy storage inductor L charged state, in passive power factor correcting circuit in this application, it can use
The energy storage inductor L of more small inductor amount replaces the energy storage inductor L on circuit in the related technology, to realize subtracting for inductance volume
It is small, in conjunction with the first capacitive element C1 and the second capacitive element C2 equally minimized, reach the mesh of entire circuit miniaturization setting
's.
On the other hand, if be arranged with energy storage inductor L using identical specification with capacitive element in the related technology, by
In adaptation variation of the inductive capacity under different operating conditions, then it can be realized better filter effect and PFC effect.
In addition, by concatenated first capacitive element C1 and the second capacitive element C2 charging, additionally it is possible to prevent from passing through storage
Can electric current on inductance L it is excessive caused by magnetic saturation phenomenon, and then be conducive to be promoted the safety of entire circuit operation.
Circuit of power factor correction provided herein mainly includes to capacitive element charging process and capacitive element
Discharge process.
Fig. 7 shows the voltage oscillogram of the pulsating direct current signal after the diode by uncontrollable rectifier module, wherein
Voltage output maximum value is the maximum value U of Alternating Current Power Supply signalACpeak, and the electricity on the first capacitive element and the second capacitive element
Pressure is respectively 0.5*UACpeak。
If output voltage UABGreater than 0.5*UACpeak, i.e., within the t1 period, pass through output voltage UABTo the first capacitive
Element and the second capacitive element charge mode.
As shown in figure 3, in charging mode, power supply both powering load, while capacitive element charging is given, current direction is such as
Shown in Fig. 3, the equivalent circuit under the mode is Fig. 4, is equivalent to the first capacitive element C1 and connects with the second capacitive element C2, capacitor
Capacity reduces, and required charging current also reduces.
In charging mode, as shown in figure 8, inductive current ILFirst increase, it is rear to reduce, as shown in the t1 period in Fig. 8, directly
Flow busbar voltage UdcAs UAB, as shown in Fig. 7 and Fig. 9.
If output voltage UABLess than 0.5*UACpeak, it is corresponding within the t2 period, pass through the first capacitive element C1 and second
Capacitive element C2 discharges with powering load.
Under discharge mode, UABVoltage be less than capacitor C1, the voltage on C2, power supply can not powering load.At this point, can only
Capacitor powering load, discharge current are equivalent to two capacitors as shown in figure 5, equivalent circuit diagram under the mode is Fig. 6
C1, C2 are in parallel, and capacitance increases, so as to biggish discharge current, to meet the power demands to load.
As shown in the t2 period in Fig. 8, under discharge mode, inductive current ILIt is zero, DC bus-bar voltage UdcIt is single
Voltage 0.5UACpeak on capacitive element, as shown in the t2 period in Fig. 9.
In the above-described embodiments, optionally, the first capacitive element C1 is identical as the capacity of the second capacitive element C2.
In this embodiment, by using the first capacitive element C1 of same size and the second capacitive element C2, i.e., first
Capacitive element C1 is identical as the capacity of the second capacitive element C2 (C1=C2), to the first capacitive element C1 and the second capacitive element
When C2 charges, the first capacitive element C1 is equivalent to the second capacitive element C2 and connects, the capacitance C=C1/2 after series connection,
When first capacitive element C1 and the second capacitive element C2 discharges, the first capacitive element C1 and the second capacitive element C2 are equivalent to simultaneously
Connection, the capacitance C=2*C1 after parallel connection, the setting of the capacitive element of two identical capacity, on the one hand, make the process of preparation more
Simply, on the other hand, keep the reliability of PFC process higher, in another aspect, charging electricity can be reduced in charging
Stream, in electric discharge, can guarantee small dimension capacitor in parallel to the power supply capacity of load to use the lesser inductance of inductance.
In any of the above-described embodiment, optionally, determine the first capacitive element C1's according to supply current needed for load
The capacity of capacity and the second capacitive element C2.
In this embodiment, by determining the capacity of capacitive element according to power supply circuit needed for load, to meet not
When control rectification module can not be powered load, meet capacitive element to the power demands of load.
In any of the above-described embodiment, optionally, allow to fill according to the first capacitive element C1 and the second capacitive element C2
Electric current determines the inductance of energy storage inductor L.
In this embodiment, energy storage inductor L passes through the charging current progress type selecting flowed through, therefore is using concatenated capacitive
When element replaces single capacitive element to receive charging signals, required charging current reduces, therefore the inductance of required energy storage inductor
Amount also reduces, it is thus determined that the energy storage inductor used can have smaller volume and lower cost.
In this embodiment, electric current when powering load is depended on due to the capacitance of capacitor, it is identical when being needed in load
In the case where electric current, passive power factor correcting circuit provided by the present application is compared to passive power factor school in the related technology
A case where capacitive element is provided only in positive circuit, the capacity of the first capacitive element C1 can be capacitive member in traditional circuit
The half of part capacity, while the capacity of the second capacitive element C2 is also possible to its electricity of the half of capacitive element capacity in traditional circuit
Hold, in conjunction with the one-way conduction characteristic of first diode D1, the second diode D2 and third diode D3, in different working conditions
Make the first capacitive element C1 that there is different connection relationships from the second capacitive element C2, different connection relationships corresponds to different electricity
Hold capacity, low capacity can make required inductance smaller, and the power demands to load can be satisfied in large capacity.
In any of the above-described embodiment, optionally, power supply module includes: power supply AC, for exporting Alternating Current Power Supply signal；It is whole
Unit is flowed, for Alternating Current Power Supply signal to be converted to pulsating direct current signal, wherein the high-voltage output end of rectification unit is connected to storage
Energy inductance L, the low-voltage output of rectification unit are connected to the cathode of the second capacitive element C2.
Wherein, rectification unit is diode uncontrollable rectifier unit.
In any above-described embodiment, optionally, passive power factor correcting circuit further include: inverter, inverter
First input end is connected to the anode of the first capacitive element C1, and the second input terminal of inverter is connected to the second capacitive element C2's
Cathode, inverter are used to the busbar voltage inversion at the first capacitive element C1 and the second both ends capacitive element C2 be AC signal,
And input load.
In the above-described embodiments, optionally, if load includes that single phase ac loads, inverter includes corresponding single-phase inverse
Power transformation road, single-phase inversion circuit include: two upper bridge arm power devices and two lower bridge arm power devices, access power factor school
Between the positive high voltage bus end of module and the low-voltage bus bar end of power factor correction module, if load includes that three-phase alternating current loads,
Then inverter includes corresponding three-phase inverting circuit, and three-phase inverting circuit includes: three upper bridge arm power devices and three lower bridges
Arm power device accesses between high voltage bus end and low-voltage bus bar end, wherein the upper bridge arm power device of phase and one
The lower bridge arm power device series connection of corresponding phase connects, and the upper bridge arm power device of same phase is different from lower bridge arm power device
When be connected.
In this embodiment, it if load includes single phase ac load, is provided in inverter corresponding single-phase inverse
Power transformation road, to export corresponding driving signal to single phase ac load.Specifically, single phase ac load can be monophase machine,
It is also possible to single-phase inductive load.
Wherein, single-phase inversion circuit includes two upper bridge arm power devices and two lower bridge arm power devices, is connected to appearance
Between the deferent segment of property element and the input terminal of load.
If load includes three-phase alternating current load, corresponding three-phase inverting circuit is provided in inverter, with to three
Phase AC load exports corresponding driving signal.Specifically, three-phase alternating current load can be induction machine, and it is same to be also possible to permanent magnetism
Walk motor.
Wherein, three-phase inverting circuit includes three upper bridge arm power devices and three lower bridge arm power devices, is connected to appearance
Between the deferent segment of property element and the input terminal of load.The lower bridge of the upper corresponding phase of bridge arm power device of each phase
The series connection of arm power device, the upper bridge arm power device and lower bridge arm power device of same-phase will not simultaneously turn on, and intersect to three
The load of current load exports a phase driving signal, and the upper bridge arm power device and lower bridge arm power device of three phases are alternately led
Logical, the load loaded to three-phase alternating current exports three-phase driving signal.
In the above-described embodiments, the first capacitive element includes a capacity cell or multiple capacity cells；Second capacitive member
Part includes a capacity cell or multiple capacity cells, wherein multiple capacity cells are in parallel and/or are arranged in series.
In the above-mentioned technical solutions, optionally, capacity cell is electrolytic capacitor.
Embodiment two
The household appliance of embodiment according to the present invention, comprising: any in load and such as first aspect present invention embodiment
Passive power factor correcting circuit, passive power factor correcting circuit access between power supply and load, Passive Power because
Number correcting circuit is configured as control power supply signal and powers to the load.
In this embodiment, household appliance passes through the passive power factor correcting circuit being arranged in any of the above-described embodiment,
To have all of the above beneficial effect, details are not described herein.
In above-described embodiment, household appliance includes air conditioner, refrigerator, fan, smoke exhaust ventilator, dust catcher and host computer
At least one of.
Specifically, household appliance includes but is not limited to air conditioner, refrigerator, fan, smoke exhaust ventilator, dust catcher and computer master
One of machine is a variety of, it is to be understood that above-mentioned electrical equipment can configure passive power factor provided by the present application
The structure of correcting circuit reaches the inductance and capacitor using low capacity, achieve the purpose that reduce product cost, or use with it is existing
The inductance and capacitor of the same amount of capacity of technology are to reach better filter effect.
In the present invention, term " first ", " second ", " third " are only used for the purpose of description, and should not be understood as indicating
Or imply relative importance；Term " multiple " then refers to two or more, unless otherwise restricted clearly.Term " installation ",
The terms such as " connected ", " connection ", " fixation " shall be understood in a broad sense, for example, " connection " may be a fixed connection, being also possible to can
Dismantling connection, or be integrally connected；" connected " can be directly connected, can also be indirectly connected through an intermediary.For this
For the those of ordinary skill in field, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In description of the invention, it is to be understood that the instructions such as term " on ", "lower", "left", "right", "front", "rear"
Orientation or positional relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of the description present invention and simplification is retouched
It states, rather than the device or unit of indication or suggestion meaning must have specific direction, be constructed and operated in a specific orientation,
It is thus impossible to be interpreted as limitation of the present invention.
In the description of this specification, the description of term " one embodiment ", " some embodiments ", " specific embodiment " etc.
Mean that particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one reality of the invention
It applies in example or example.In the present specification, schematic expression of the above terms are not necessarily referring to identical embodiment or reality
Example.Moreover, description particular features, structures, materials, or characteristics can in any one or more of the embodiments or examples with
Suitable mode combines.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (12)
1. a kind of passive power factor correcting circuit characterized by comprising power supply module and power factor correction module, institute
Power supply module is stated for output ripple direct current signal, the power factor correction module, for the pulsating direct current signal into
Row PFC, to input the direct current signal after correction to load supplying, the power factor correction module includes:
The energy storage inductor of series connection, the first capacitive element, first switch device and the second capacitive element, the energy storage inductor connect
It is connected to the anode of first capacitive element, the cathode of first capacitive element is connected to the input of the first switch device
Grade, the anode of second capacitive element are connected to the output stage of the first switch device；
Second switch device, the input stage of the second switch device is connected to the input stage of second capacitive element, described
The output stage of second switch device is connected between the energy storage inductor and first capacitive element；
Third switching device, the input stage of the third switching device are connected to the cathode of second capacitive element, and described
The output stage of three switching devices is connected between first capacitive element and the first switch device,
Wherein, the second switch device and the third switch device conductive, the first switch device cut-off, described first
Capacitive element and the second capacitive element discharge, and the first switch break-over of device, the second switch device is opened with the third
Device cut-off is closed, is charged by the pulsating direct current signal to first capacitive element and second capacitive element.
2. passive power factor correcting circuit according to claim 1, which is characterized in that
The switching device be diode or switching tube,
Wherein, the anode of the diode is determined as the input stage, the cathode of the diode is determined as the output
Grade.
3. passive power factor correcting circuit according to claim 1, which is characterized in that
First capacitive element is identical as the capacity of second capacitive element.
4. passive power factor correcting circuit according to claim 1, which is characterized in that
The capacity and second capacitive element of first capacitive element are determined according to supply current needed for the load
Capacity.
5. passive power factor correcting circuit according to claim 3, which is characterized in that
The electricity of the energy storage inductor is determined according to the permission charging current of first capacitive element and second capacitive element
Sensibility reciprocal.
6. passive power factor correcting circuit according to any one of claim 1 to 5, which is characterized in that the power supply
Module includes:
Power supply, for exporting Alternating Current Power Supply signal；
Rectification unit, for the Alternating Current Power Supply signal to be converted to the pulsating direct current signal,
Wherein, the high-voltage output end of the rectification unit is connected to the energy storage inductor, the low-voltage output of the rectification unit
It is connected to the cathode of second capacitive element.
7. passive power factor correcting circuit according to claim 6, which is characterized in that the rectification unit is diode
Uncontrollable rectifier unit.
8. passive power factor correcting circuit according to any one of claim 1 to 5, which is characterized in that further include:
Inverter, the first input end of the inverter are connected to the anode of first capacitive element, and the of the inverter
Two input terminals are connected to the cathode of second capacitive element, and the inverter is used for will first capacitive element and described the
The busbar voltage inversion at two capacitive element both ends is AC signal, and inputs the load.
9. passive power factor correcting circuit according to claim 8, which is characterized in that
If the load includes that single phase ac loads, the inverter includes corresponding single-phase inversion circuit, described single-phase inverse
Power transformation road includes:
Two upper bridge arm power devices and two lower bridge arm power devices, access the high voltage bus of the power factor correction module
Between end and the low-voltage bus bar end of the power factor correction module,
If the load includes that three-phase alternating current loads, the inverter includes corresponding three-phase inverting circuit, three contrary
Power transformation road includes:
Three upper bridge arm power devices and three lower bridge arm power devices, access the high voltage bus end and the low-voltage bus bar end
Between,
Wherein, the upper bridge arm power device with the lower bridge arm power device of a corresponding phase of a phase are connected phase
It connects, the upper bridge arm power device and the lower bridge arm power device of same phase do not simultaneously turn on.
10. passive power factor correcting circuit according to any one of claim 1 to 5, which is characterized in that
First capacitive element includes a capacity cell or multiple capacity cells；
Second capacitive element includes a capacity cell or multiple capacity cells,
Wherein, the multiple capacity cell is in parallel and/or is arranged in series.
11. a kind of household appliance characterized by comprising
Load；
Passive power factor correcting circuit as described in any one of claims 1 to 10, the passive power factor correction electricity
Road is accessed between power supply and the load, and the passive power factor correcting circuit is configured as control power supply signal to described
Load supplying.
12. household appliance according to claim 11, which is characterized in that
The household appliance includes at least one of air conditioner, refrigerator, fan, smoke exhaust ventilator, dust catcher and host computer.
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| CN201910594782.9A CN110224584A (en) | 2019-07-03 | 2019-07-03 | Household appliance and its passive power factor correcting circuit |
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| CN201910594782.9A CN110224584A (en) | 2019-07-03 | 2019-07-03 | Household appliance and its passive power factor correcting circuit |
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