CN108880223A - A kind of PFC voltage follower circuit - Google Patents
A kind of PFC voltage follower circuit Download PDFInfo
- Publication number
- CN108880223A CN108880223A CN201810683656.6A CN201810683656A CN108880223A CN 108880223 A CN108880223 A CN 108880223A CN 201810683656 A CN201810683656 A CN 201810683656A CN 108880223 A CN108880223 A CN 108880223A
- Authority
- CN
- China
- Prior art keywords
- pfc
- voltage
- resistance
- follower circuit
- voltage follower
- Prior art date
- 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
- H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
-
- 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 present invention provides a kind of PFC voltage follower circuit, uses PFC voltage follow module, is measured in real time to input voltage, and adjust output voltage according to testing result, and output voltage is reduced when input voltage is lower, realizes that output voltage follows input voltage to change.The configuration of the present invention is simple, it is at low cost.The present invention is by forming voltage follower circuit on existing mature pfc circuit, to realize following for PFC voltage, when input voltage is lower by output voltage synchronous adjustment to lower value, to which the impact to the switching power devices for realizing voltage transformation be effectively reduced, extend the service life of power device, improves the working efficiency of power supply entirety.
Description
Technical field
The present invention relates to electronic circuit fields, in particular to pfc circuit.
Background technique
The existing pfc circuit output voltage with the design of BOOST electric source topology is a fixed value, and need to be higher than highest
Input voltage peak value.Due to input network voltage fluctuation range it is very big, when input voltage be in lower voltage, input with it is defeated
Excessively high pressure difference generates very big stress to power device between out, this stress will increase the loss of device, and reduce circuit can
By property, and influence the service life of circuit.
Summary of the invention
The shortcomings that generating for pfc circuit in the prior art mentioned above in voltage transformation, the present invention provide one
The new PFC voltage follower circuit of kind, uses PFC voltage follow module, is measured in real time to input voltage, and according to detection
As a result output voltage is adjusted, output voltage is reduced when input voltage is lower, realizes that output voltage follows input voltage to change, solves
The certainly above problem.
The technical solution used to solve the technical problems of the present invention is that：A kind of PFC voltage follower circuit, voltage follower circuit
Chip, PFC voltage follow module, output voltage feedback module are controlled including PFC.PFC voltage follow module detects input voltage,
Output adjustment signal gives output voltage feedback module, and output voltage feedback module connects PFC chip output voltage feedback end, PFC
Chip is according to feedback end signal modulation PFC output voltage
The PFC voltage follow module includes rectifier bridge BD1, resistance R1, resistance R2, capacitor C1, transistor Q2 and electricity
Hinder R3.Rectifier bridge BD1 input connection alternating current, rectifier bridge output plus terminal connect resistance R1, and rectifier bridge exports negativing ending grounding, resistance R2
One end connects resistance R1, resistance R2 other end ground connection, and resistance R1 connects transistor Q2 ground level, transistor with the common point of resistance R2
Q2 emitting stage connects resistance R3, and transistor Q2 collector connects PFC and controls chip output voltage feedback end VFB, and resistance R3 is another
End ground connection.
The PFC voltage follow module further includes the voltage limitation electricity being made of diode D1 and protection reference voltage Vpro
Road, diode cathode connect transistor Q2 ground level, diode cathode connection protection reference voltage Vpro.
The transistor Q2 uses NPN type triode.
The PFC control chip U1 is that the PFC of arbitrary patterns controls chip.
The boost follower circuit further includes feedback module, and feedback module samples PFC output end voltage Vout, and feeds back
Chip U1 is controlled to PFC.
The present invention can achieve following beneficial effect：The configuration of the present invention is simple, it is at low cost.The present invention by it is existing at
Voltage follower circuit is formed on ripe pfc circuit, so that following for PFC voltage is realized, it will output electricity when input voltage is lower
It presses synchronous adjustment to lower value, so that the impact to the switching power devices for realizing voltage transformation be effectively reduced, makes power device
Service life extended.Improve the working efficiency of power supply entirety.
Detailed description of the invention
Fig. 1 is circuit block diagram of the present invention.
Fig. 2 is circuit diagram of the present invention.
Specific embodiment
Specific embodiments of the present invention will be described in detail with reference to the accompanying drawing.
Attached drawing 1 and attached drawing 2 are please referred to, the present invention mainly controls chip U1, Voltage Feedback by PFC voltage follow module, PFC
Module composition.In the present embodiment, PFC voltage follow module is connected on mains electricity input end and output voltage feedback end, detection
Line voltage adjusts output voltage.In the present embodiment, PFC voltage follow module includes the rectified current being made of rectifier bridge BD1
Road, the filter circuit being made of resistance R1, resistance the R2 bleeder circuit formed and capacitor C1.The input of rectifier bridge BD1 connects respectively
Connect L, the N-terminal of input alternating current.Rectifier bridge BD1 output plus terminal connecting resistance R1, rectifier bridge BD1 negativing ending grounding form rectification circuit, will
Electric main is made into direct current.The one end resistance R2 connects R1, and resistance R2 other end ground connection forms partial pressure electricity by resistance R1 and resistance R2
Road divides high voltage direct current, and the common point of resistance R1 resistance R2 exports low-voltage direct.Capacitor C1 is connected in parallel on the both ends resistance R2, will
Pulsating dc voltage is filtered into average voltage.
In the present embodiment, cascode grade amplifying circuit is formed by transistor Q2 and resistance R3, transistor Q2 ground level connects resistance
R1 and R2 and common point, the emitting stage of transistor Q2 connect resistance R3, and the collector of resistance R3 other end ground connection, transistor Q2 connects
Meet the pressure feedback port VFB of PFC control chip U1.Wherein, transistor Q2 uses NPN type triode.
In the present embodiment, voltage limiting circuit is formed by diode D1 and protection reference voltage Vpro, diode cathode connects
Meet transistor Q2 ground level, diode cathode connection protection reference voltage Vpro.
In the present embodiment, PFC controls output voltage feedback end VFB connection the resistance R4 and R5 of chip U1, resistance R4 connection
Defeated pfc circuit output voltage terminal Vout, resistance R5 ground connection.
The operation principle of the present invention is that electric main forms pulsating dc voltage, the electricity after rectifier bridge BD1 rectification
High-pressure pulsating DC voltage is reduced to low pressure pulsating dc voltage, institute by the bleeder circuit being made of resistance R1, resistance R2 by pressure
The intrinsic standoff ratio for stating bleeder circuit is R1/R2.
According to the result that above-mentioned partial pressure obtains, the voltage VR2 at the both ends R2 is calculated according to the following formula:
Wherein, VIN is input alternating current virtual value.
The voltage at the both ends R2 is filtered by capacitor C1 again, forms steady dc voltage.According to sine wave virtual value and averagely
The relationship of value, there is Vavg=0.9Vrms.Wherein Vavg is sinusoidal popin mean value, and Vrms is sine wave virtual value.
Therefore, it is calculated according to the following formula by the voltage at the capacitor C1 filtered both ends resistance R2：
VB=VR2 × 0.9
Wherein, VB is the mean voltage at the both ends R2, that is, triode Q2 base voltage.
The base voltage provides base current, turn-on transistor Q2 to triode Q2.Triode Q2 emitting stage electric current Ie
It is calculated by following formula：
It is ground level emitting stage junction voltage that wherein Vbe, which is triode Q2,.
For triode Q2 when being in magnifying state, collector current Ic is equal to emitting stage electric current Ie.Transistor collector electricity
It flows Ic and flows into collector by feedback resistance R4 by PFC output voltage.
PFC controls chip output voltage feedback end VFB connection and feeds back mould by the output voltage that resistance R4 and resistance R5 are formed
Block,
PFC controls chip output voltage feedback end VFB outputting reference reference voltage Vref, flow through the electric current I5 of resistance R5 by
Following formula is calculated：
The electric current I4 flowed through on resistance R4 is calculated by following formula：
I4=I5+Ic=I5+Ie
The voltage VR4 at the both ends resistance R4 is calculated by following formula：
VR4=I4 × R4
Output busbar voltage Vout is calculated by following formula：
Vout=VR4+Vref
Therefore, by the way that suitable parameter is arranged, output voltage will be avoided with output line voltage Serial regulation in low alternating current
When input, busbar voltage is in high pressure conditions always.
Protect reference voltage Vpro by diode D1 limit transistor Q2 base voltage VB, VB maximum value VBmax under
Formula obtains：
VBmax=VPRO-Vf
Wherein Vf is the forward voltage drop of diode D1.
When input voltage is extremely higher, output voltage is limited in definite value, avoids pfc circuit excessive pressure damages.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (7)
1. a kind of PFC voltage follower circuit, it is characterised in that：The voltage follower circuit includes PFC control chip, PFC electricity
Pressure follows module, output voltage feedback module.
2. a kind of PFC voltage follower circuit according to claim 1, it is characterised in that：The PFC control chip draws
Foot contains output voltage feedback end VFB.
3. a kind of PFC voltage follower circuit according to claim 1, it is characterised in that：The output voltage feedback module
It is connected in series by resistance R4 and resistance R5, resistance R4 connection pfc circuit output end vo ut, resistance R5 ground connection, resistance R4 and resistance
The common point connection PFC of R5 controls chip output voltage feedback end VFB.
4. a kind of PFC voltage follower circuit according to claim 1, it is characterised in that：The PFC voltage follow module
Including rectifier bridge BD1, rectifier bridge BD1 input connection alternating current, rectifier bridge output plus terminal connects resistance R1, and rectifier bridge output negative terminal connects
Ground, the one end resistance R2 connect resistance R1, resistance R2 other end ground connection, and resistance R1 connects transistor Q2 base with the common point of resistance R2
Grade, transistor Q2 emitting stage connect resistance R3, and transistor Q2 collector connects PFC and controls chip output voltage feedback end, resistance
R3 other end ground connection.
5. a kind of PFC voltage follower circuit according to claim 4, it is characterised in that：The transistor Q2 uses NPN
Type triode.
6. a kind of PFC voltage follower circuit according to claim 4, it is characterised in that：The resistance R2 is connected in parallel
There is capacitor C1.
7. a kind of according to claim 1, PFC voltage follower circuit described in 2,3,4,5 or 6, it is characterised in that：The PFC
Voltage follow module further includes the voltage limiting circuit being made of diode D1 and protection reference voltage Vpro, and diode cathode connects
Meet transistor Q2 ground level, diode cathode connection protection reference voltage Vpro.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810683656.6A CN108880223A (en) | 2018-06-28 | 2018-06-28 | A kind of PFC voltage follower circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810683656.6A CN108880223A (en) | 2018-06-28 | 2018-06-28 | A kind of PFC voltage follower circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108880223A true CN108880223A (en) | 2018-11-23 |
Family
ID=64296196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810683656.6A Pending CN108880223A (en) | 2018-06-28 | 2018-06-28 | A kind of PFC voltage follower circuit |
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| Country | Link |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2753056Y (en) * | 2004-12-03 | 2006-01-18 | 深圳市核达中远通电源技术有限公司 | Power factor correct circuit with sectional control function |
| JP2010213423A (en) * | 2009-03-09 | 2010-09-24 | Nec Wireless Networks Ltd | Power factor improving circuit |
| CN102332836A (en) * | 2011-06-14 | 2012-01-25 | 深圳茂硕电源科技股份有限公司 | PFC boost follower circuit |
| CN103208921A (en) * | 2012-01-11 | 2013-07-17 | 立锜科技股份有限公司 | Tracking boosting device and method for power factor correction circuit |
| CN103490606A (en) * | 2012-06-11 | 2014-01-01 | 力铭科技股份有限公司 | Power factor correction circuit with multiple sets of output voltages |
| US20150138442A1 (en) * | 2013-11-20 | 2015-05-21 | Samsung Electronics Co., Ltd. | Power supply apparatus and display apparatus using the same |
| CN105162316A (en) * | 2015-09-30 | 2015-12-16 | 南京理工大学 | High-power-factor CRM Buck PFC converter |
| CN205753986U (en) * | 2016-06-16 | 2016-11-30 | 深圳市越宏普照照明科技有限公司 | PFC segmentation booster circuit and Switching Power Supply |
-
2018
- 2018-06-28 CN CN201810683656.6A patent/CN108880223A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2753056Y (en) * | 2004-12-03 | 2006-01-18 | 深圳市核达中远通电源技术有限公司 | Power factor correct circuit with sectional control function |
| JP2010213423A (en) * | 2009-03-09 | 2010-09-24 | Nec Wireless Networks Ltd | Power factor improving circuit |
| CN102332836A (en) * | 2011-06-14 | 2012-01-25 | 深圳茂硕电源科技股份有限公司 | PFC boost follower circuit |
| CN103208921A (en) * | 2012-01-11 | 2013-07-17 | 立锜科技股份有限公司 | Tracking boosting device and method for power factor correction circuit |
| CN103490606A (en) * | 2012-06-11 | 2014-01-01 | 力铭科技股份有限公司 | Power factor correction circuit with multiple sets of output voltages |
| US20150138442A1 (en) * | 2013-11-20 | 2015-05-21 | Samsung Electronics Co., Ltd. | Power supply apparatus and display apparatus using the same |
| CN105162316A (en) * | 2015-09-30 | 2015-12-16 | 南京理工大学 | High-power-factor CRM Buck PFC converter |
| CN205753986U (en) * | 2016-06-16 | 2016-11-30 | 深圳市越宏普照照明科技有限公司 | PFC segmentation booster circuit and Switching Power Supply |
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| PB01 | Publication | ||
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Application publication date: 20181123 |