CN108923636A - A kind of pfc circuit - Google Patents
A kind of pfc circuit Download PDFInfo
- Publication number
- CN108923636A CN108923636A CN201810754587.3A CN201810754587A CN108923636A CN 108923636 A CN108923636 A CN 108923636A CN 201810754587 A CN201810754587 A CN 201810754587A CN 108923636 A CN108923636 A CN 108923636A
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- CN
- China
- Prior art keywords
- circuit
- pfc
- output end
- connect
- diode
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
-
- 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
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- 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)
- Rectifiers (AREA)
Abstract
The invention discloses a kind of pfc circuits, including full-bridge rectifier, PFC branch, filter capacitor, cathode output end OUT+, cathode output end connects OUT-, driving circuit and warning circuit, the input terminal of the full-bridge rectifier connects power grid Vac, the output end of the full-bridge rectifier is connected with PFC branch, the PFC branch includes inductance, first diode and first switch tube, described filter capacitor one end is connect with cathode output end OUT+ and the other end connect OUT- connection with cathode output end, the warning circuit includes second switch and the second diode, the second switch and the second Diode series, the second switch is connect with driving circuit.The invention enables user can the multiple present invention of difference selection according to the actual situation carry out it is in parallel, to reduce the component difficulty and circuit cost of single pfc circuit in generation the case where avoiding PFC branch redundancy while outputting and inputting current ripples for being completely counterbalanced by PFC branch.
Description
Technical field
The present invention relates to power factor correction technology field, in particular to a kind of pfc circuit.
Background technique
Pfc circuit has the function of improving power factor (PF) and reduces Harmonics of Input content, is widely used in electric power
Among electronic equipment.
The utility model patent of patent application publication CN204068686U discloses a kind of pfc circuit, more by being equipped with
PFC branch can reduce the fluctuation of output voltage and reduce the ripple current of filter capacitor, but it is in actual use
In the presence of generation the case where needing difference to easily cause PFC branch redundancy according to equipment, while it can also improve the complexity of single pfc circuit
Difficulty and circuit cost.
Therefore, it is necessary to solve the above problems to invent a kind of pfc circuit.
Summary of the invention
The purpose of the present invention is to provide a kind of pfc circuit, user can according to the actual situation difference selection it is multiple
The present invention carry out it is in parallel, to avoid PFC branch while outputting and inputting current ripples be completely counterbalanced by PFC branch
The case where redundancy, occurs, and reduces the component difficulty and circuit cost of single pfc circuit, to solve to propose in above-mentioned background technique
The problem of.
To achieve the above object, the present invention provides the following technical solutions：A kind of pfc circuit, including full-bridge rectifier, PFC
Branch, filter capacitor, cathode output end OUT+, cathode output end connection OUT-, driving circuit and warning circuit, the full-bridge are whole
The input terminal for flowing device connects power grid Vac, and the output end of the full-bridge rectifier is connected with PFC branch, and the PFC branch includes electricity
Sense, first diode and first switch tube, described filter capacitor one end connect with cathode output end OUT+ and the other end with bear
Pole output end connects OUT- connection, and the warning circuit includes second switch and the second diode, the second switch and
Second Diode series, the second switch are connect with driving circuit.
Preferably, the first diode is connected with first switch tube.
Preferably, the cathode connecting pin of the anode connection terminal of the first diode and first switch tube connects.
Preferably, the cathode connecting pin of the first diode is connect with cathode output end OUT+, the first switch tube
Anode connection terminal connect OUT- with cathode output end.
Preferably, the connection of the cathode output end of described inductance one end and full-bridge rectifier and the other end and first diode
It is connected with the contact of first switch tube.
Preferably, the invention also includes input voltage detection circuit, input electric cur- rent measure circuit and output voltage detection electricity
Road.
Preferably, the connection of the cathode output end of described input voltage detection circuit one end and full-bridge rectifier and the other end
It is connect with the cathode output end of full-bridge rectifier.
Preferably, the connection of the cathode output end of the input electric cur- rent measure circuit on one side and full-bridge rectifier and the other end
It is connect with first switch tube.
Preferably, described output voltage detecting circuit one end connect with cathode output end OUT+ and the other end and cathode it is defeated
Outlet connects OUT- connection.
Preferably, the warning circuit, voltage detecting circuit, input electric cur- rent measure circuit and output voltage detecting circuit are equal
It is connect with driving circuit.
Technical effect and advantage of the invention：
1, the present invention is greater than setting number by being equipped with warning circuit in order to remaining output and input current ripples amount
When value, the second diode in driving circuit control warning circuit, which lights, alarms, to remind construction personnel, then constructs
Personnel can on the basis of original two present invention are in parallel the present invention in parallel again, then check the second diode again
Whether light, when the second diode lights again, then continues to improve quantity in parallel of the invention, when the second diode does not work
When, then the current ripples that output and input for representing PFC branch are cancelled completely, so that user can be according to the actual situation
The multiple present invention of difference selection carry out it is in parallel, thus being completely counterbalanced by while outputting and inputting current ripples of PFC branch
The case where avoiding PFC branch redundancy generation, reduces the component difficulty and circuit cost of single pfc circuit；
2, what the present invention can allow the PFC branch in two present invention outputs and inputs the mutual part of current ripples
Or be completely counterbalanced by, substantially reduce PFC branch outputs and inputs the ripple of electric current, to reduce pfc circuit to input
The disturbance of voltage reduces the common mode EMI interference of pfc circuit, also increases the output voltage of pfc circuit and the wave of output electric current
Dynamic frequency reduces the fluctuation of output voltage, reduces the ripple current of filter capacitor.
Detailed description of the invention
Fig. 1 is overall structure diagram of the invention.
Fig. 2 is warning circuit structural schematic diagram of the invention.
In figure：1 full-bridge rectifier, 2 inductance, 3 first diodes, 4 first switch tubes, 5 filter capacitors, 6 second switches,
7 second diodes.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment 1
The present invention provides a kind of pfc circuits as shown in Figs. 1-2, including full-bridge rectifier 1, PFC branch, filter capacitor
5, cathode output end OUT+, cathode output end connection OUT-, driving circuit and warning circuit, the input of the full-bridge rectifier 1
End connection power grid Vac, the output end of the full-bridge rectifier 1 are connected with PFC branch, and the PFC branch includes inductance 2, first
Diode 3 and first switch tube 4, described 5 one end of filter capacitor connect with cathode output end OUT+ and the other end and cathode it is defeated
Outlet connects OUT- connection, and the warning circuit includes second switch 6 and the second diode 7, the second switch 6 and the
The series connection of two diodes 7, the second switch 6 are connect with driving circuit.
As can be seen from the above embodiments：The present invention is by being equipped with warning circuit, in order to remaining output and input electric current
When ripple quantity is greater than setting numerical value, the second diode 7 in driving circuit control warning circuit, which lights, alarms, to remind
Construction personnel, then construction personnel can on the basis of original two present invention are in parallel the present invention in parallel again, then
It checks whether the second diode 7 lights again, when the second diode 7 lights again, then continues to improve number in parallel of the invention
Amount, when the second diode 7 does not work, then the current ripples that output and input for representing PFC branch are cancelled completely, so that making
User can the multiple present invention of difference selection according to the actual situation carry out it is in parallel, thus in the input for being completely counterbalanced by PFC branch
The case where PFC branch redundancy is avoided while with output current ripple generation, reduce the component difficulty of single pfc circuit with
And circuit cost.
Embodiment 2
Further, in above-described embodiment 1, the first diode 3 is connected with first switch tube 4；
The anode connection terminal of the first diode 3 is connect with the cathode connecting pin of first switch tube 4；
The cathode connecting pin of the first diode 3 is connect with cathode output end OUT+, the anode of the first switch tube
Connecting pin connect OUT- with cathode output end；
Described 2 one end of inductance is connect with the cathode output end of full-bridge rectifier 1 and the other end and first diode 3 and the
The contact of one switching tube 4 connects；
The invention also includes input voltage detection circuit, input electric cur- rent measure circuit and output voltage detecting circuits；
Described input voltage detection circuit one end is connect with the cathode output end of full-bridge rectifier 1 and the other end and full-bridge
The cathode output end of rectifier 1 connects；
The input electric cur- rent measure circuit on one side is connect with the cathode output end of full-bridge rectifier 1 and the other end and first
Switching tube 4 connects；
Described output voltage detecting circuit one end is connect with cathode output end OUT+ and the other end connects with cathode output end
Connect OUT- connection；
The warning circuit, voltage detecting circuit, input electric cur- rent measure circuit and output voltage detecting circuit with driving
Circuit connection.
Working principle of the present invention：
Referring to Figure of description 1, will be connected on power grid Vac after two present invention parallel connections first, so latter two present invention
In input voltage detection circuit in real time in respective circuit input voltage numerical value and its phase detect, input current inspection
Slowdown monitoring circuit in real time in respective circuit input current numerical value and its phase detect, output voltage detecting circuit is in real time to each
From in circuit output voltage numerical value and its phase detected, the driving circuit in two present invention is according to input voltage measurement
Electric current and its phase and output voltage the detection electricity that voltage and its phase that circuit detects, input electric cur- rent measure circuit detect
The voltage and its phase that road detects control the PWM letter of the on-off of the first switch tube 4 of the PFC branch in two present invention respectively
Number duty ratio, allow the PFC branch in two present invention outputs and inputs current ripples mutually partly or completely
It offsets, substantially reduce PFC branch outputs and inputs the ripple of electric current, disturbs to reduce pfc circuit to input voltage
It is dynamic, the common mode EMI interference of pfc circuit is reduced, the output voltage of pfc circuit and the vibration frequency of output electric current are also increased,
The fluctuation for reducing output voltage reduces the ripple current of filter capacitor 5；
Referring to Figure of description 1 and attached drawing 2, while driving circuit examines the remaining current ripples amount that outputs and inputs
Survey, when it is remaining output and input current ripples amount be greater than setting numerical value when, driving circuit control warning circuit in the two or two
Pole pipe 7, which lights, alarms, so that construction personnel is reminded, the basis that then construction personnel can be in parallel in original two present invention
On the present invention in parallel again, then check whether the second diode 7 lights again, when the second diode 7 lights again,
Then continue to improve quantity in parallel of the invention, when the second diode 7 does not work, then represent PFC branch outputs and inputs electric current
Ripple is cancelled completely so that user can the multiple present invention of difference selection according to the actual situation carry out it is in parallel, from
And in generation the case where avoiding PFC branch redundancy while outputting and inputting current ripples for being completely counterbalanced by PFC branch, drop
The component difficulty and circuit cost of low single pfc circuit.
Finally it should be noted that：The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features,
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (10)
1. a kind of pfc circuit, including full-bridge rectifier (1), PFC branch, filter capacitor (5), cathode output end OUT+, cathode are defeated
Outlet connects OUT-, driving circuit and warning circuit, it is characterised in that：The input terminal of the full-bridge rectifier (1) connects power grid
Vac, the output end of the full-bridge rectifier (1) are connected with PFC branch, and the PFC branch includes inductance (2), first diode
(3) and first switch tube (4), described filter capacitor (5) one end connect with cathode output end OUT+ and the other end and cathode it is defeated
Outlet connects OUT- connection, and the warning circuit includes second switch (6) and the second diode (7), the second switch
(6) it connects with the second diode (7), the second switch (6) connect with driving circuit.
2. a kind of pfc circuit according to claim 1, it is characterised in that：The first diode (3) and first switch tube
(4) it connects.
3. a kind of pfc circuit according to claim 2, it is characterised in that：The anode connection terminal of the first diode (3)
It is connect with the cathode connecting pin of first switch tube (4).
4. a kind of pfc circuit according to claim 3, it is characterised in that：The cathode connecting pin of the first diode (3)
It is connect with cathode output end OUT+, the anode connection terminal of the first switch tube connect OUT- with cathode output end.
5. a kind of pfc circuit according to claim 1, it is characterised in that：Described inductance (2) one end and full-bridge rectifier
(1) cathode output end connection and the other end is connect with the contact of first diode (3) and first switch tube (4).
6. a kind of pfc circuit according to claim 1, it is characterised in that：The invention also includes input voltage detection circuit,
Input electric cur- rent measure circuit and output voltage detecting circuit.
7. a kind of pfc circuit according to claim 6, it is characterised in that：Described input voltage detection circuit one end and complete
The cathode output end of bridge rectifier (1) connects and the other end is connect with the cathode output end of full-bridge rectifier (1).
8. a kind of pfc circuit according to claim 6, it is characterised in that：The input electric cur- rent measure circuit on one side and complete
The cathode output end of bridge rectifier (1) connects and the other end is connect with first switch tube (4).
9. a kind of pfc circuit according to claim 6, it is characterised in that：Described output voltage detecting circuit one end with just
Pole output end OUT+ connection and the other end connect OUT- connection with cathode output end.
10. a kind of pfc circuit according to claim 6, it is characterised in that：It is the warning circuit, voltage detecting circuit, defeated
Enter current detection circuit and output voltage detecting circuit is connect with driving circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810754587.3A CN108923636A (en) | 2018-07-11 | 2018-07-11 | A kind of pfc circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810754587.3A CN108923636A (en) | 2018-07-11 | 2018-07-11 | A kind of pfc circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108923636A true CN108923636A (en) | 2018-11-30 |
Family
ID=64411414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810754587.3A Pending CN108923636A (en) | 2018-07-11 | 2018-07-11 | A kind of pfc circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108923636A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101325367A (en) * | 2007-06-14 | 2008-12-17 | 海尔集团公司 | Circuit for correcting part active power factor |
| CN103166490A (en) * | 2011-12-09 | 2013-06-19 | 英特赛尔美国有限公司 | System and method of feed forward for boost converters with improved power factor and reduced energy storage |
| CN203942440U (en) * | 2014-06-20 | 2014-11-12 | 衡阳财经工业职业技术学院 | A kind of power factor regulating circuit |
| CN204068686U (en) * | 2014-09-10 | 2014-12-31 | 广东易事特电源股份有限公司 | Pfc circuit |
-
2018
- 2018-07-11 CN CN201810754587.3A patent/CN108923636A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101325367A (en) * | 2007-06-14 | 2008-12-17 | 海尔集团公司 | Circuit for correcting part active power factor |
| CN103166490A (en) * | 2011-12-09 | 2013-06-19 | 英特赛尔美国有限公司 | System and method of feed forward for boost converters with improved power factor and reduced energy storage |
| CN203942440U (en) * | 2014-06-20 | 2014-11-12 | 衡阳财经工业职业技术学院 | A kind of power factor regulating circuit |
| CN204068686U (en) * | 2014-09-10 | 2014-12-31 | 广东易事特电源股份有限公司 | Pfc circuit |
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Application publication date: 20181130 |