CN107994764A - Single phase power factor correcting circuit - Google Patents
Single phase power factor correcting circuit Download PDFInfo
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- CN107994764A CN107994764A CN201610946631.1A CN201610946631A CN107994764A CN 107994764 A CN107994764 A CN 107994764A CN 201610946631 A CN201610946631 A CN 201610946631A CN 107994764 A CN107994764 A CN 107994764A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
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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)
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Abstract
The present invention provides single phase power factor correcting circuit, including：Power circuit, detection circuit, control circuit.Power circuit is the single-phase AC DC circuits of booster type, and detection circuit is responsible for after faint current signal is amplified, and is sent to control circuit through zero phase distortion filter and rectification, control circuit is single-phase power factor correcting analog controller.In the case of high-power output, the single-phase power factor correcting device of the present invention is operated in high switching frequency, not only there is the identical effect of low switching frequency single-phase power factor correcting device, and also reduce boost inductance amount and inductance volume, at the same time, operational amplifier amplifies faint current signal in detection circuit, can reduce detection resistance resistance value, reduce power consumption, reduces fever.
Description
Technical field
The present invention relates to single-phase power factor correcting technology, the power factor corrector skill of more particularly to high-power output
Art, and in particular to reduce inspection leakage resistance under high switching frequency to realize the circuit of PFC.
Background technology
In single-phase power grid, with the fast development of Power Electronic Technique, more and more power electronic equipments are in power grid
In come into operation, especially with switching power circuit and the ac-dc-ac inverter electricity of rectifier bridge and electrolytic capacitor as front stage circuits
Road widely uses, and serious harmonic current pollution is caused to power grid.Active Power Factor Correction Technology, which becomes, solves harmonic wave
The important technology of electric current pollution, it is special especially with simulation PFC (Power Factor Correction, PFC)
With control chip form APFC circuits (Active Power Factor Correction, active power factor correction)
It is widely used in the industry, achieves good calibration result.
However, the boost inductance amount of low switching frequency power factor corrector is big, volume is big.Meanwhile under low switching frequency
Single-phase power factor correcting device shunt resistance resistance value it is big, power consumption is more, and fever is serious.If improving switching frequency again, shunting electricity
Resistance can produce more power consumptions and heat.Therefore, it is necessary to look for the low sense low-resistance single phase power factor correcting circuit of high switching frequency to come
Solve the problems, such as these.
At this stage, the design of the low sense low-resistance single phase power factor correcting circuit of high switching frequency is generally cumbersome, shunt resistance
Usually it can also produce the power consumption of bigger, send more heats, can not meet the needs of practical application.
The content of the invention
In view of the foregoing deficiencies of prior art, it is an object of the invention to provide single phase power factor correcting circuit,
For solving the above-mentioned problems in the prior art.
In order to achieve the above objects and other related objects, the present invention provides a kind of single phase power factor correcting circuit, including：
Power circuit, for ac signal to be converted into the first DC signal and is exported；Detection circuit, connects the power electricity
Road, for sampling shunt resistance electric signal according to the ac signal, is amplified and converted to the second DC signal and exports；
Control circuit, connects the power circuit and the detection circuit respectively, for according to first DC signal and described
Second DC signal carries out PFC.
In one embodiment of the invention, the power circuit includes：The single-phase AC-DC circuits of booster type.
In one embodiment of the invention, the single-phase AC-DC circuits of booster type, including：First power diode, the second work(
Rate diode, the 3rd power diode, the 4th power diode, boost inductance, reversely power field effect pipe, two poles of fast recovery
Pipe, the first capacitance, first resistor and the 19th resistance and filter capacitor, wherein, the cathode of the first power diode, the second work(
One end of the anode of rate diode and the first capacitance is connected with power firestreak, the other end, the 3rd power diode of the first capacitance
Cathode and the anode of the 4th power diode be connected with zero-power line, the anode of the first power diode, two pole of the 3rd power
One end of the anode of pipe, one end of first resistor and boost inductance is connected, and forms the first positive output end, two pole of the second power
The cathode of pipe, the cathode of the 4th power diode, one end of the 19th resistance and the other end of first resistor are connected, and are formed
For connecting the first negative output terminal of the control circuit, the other end of the 19th resistance, one end of power field effect pipe and filter
One end of ripple capacitance is connected and is grounded, and forms the second negative output terminal of the power circuit, the other end, the power of boost inductance
The cathode of the other end of field-effect tube and reverse fast recovery diode is connected, the anode and filtered electrical of reverse fast recovery diode
The other end of appearance is connected, and forms the second positive output end of the power circuit.
In one embodiment of the invention, the detection circuit includes：Current Mutual Inductance circuit, operational amplification circuit, wherein, institute
Stating Current Mutual Inductance circuit includes：Current transformer, second resistance, wherein, one end of current transformer primary side and the 4th power
The anode of diode is connected, and the other end of current transformer primary side is connected with zero-power line, and the one of Current Transformer Secondary side
End, one end of second resistance are connected and are grounded；The operational amplification circuit includes：3rd resistor, the 4th resistance, the 5th resistance,
And first operational amplifier, wherein, one end of 3rd resistor, the other end of second resistance and Current Transformer Secondary side it is another
One end is connected, and the other end of 3rd resistor is connected with the positive input terminal of the first operational amplifier, one end ground connection of the 4th resistance, the
The negative input end of the other end of four resistance, one end of the 5th resistance and the first operational amplifier is connected, the other end of the 5th resistance
It is connected with the output terminal of the first operational amplifier, and forms the output terminal of the operational amplification circuit.
In one embodiment of the invention, the detection circuit further includes：Filter circuit, and/or rectification circuit, wherein, when
When only including filter circuit, the filter circuit is connected between the operational amplification circuit and the control circuit；When only wrapping
When including rectification circuit, the rectification circuit is connected between the operational amplification circuit and the control circuit；When including filtering
When circuit and rectification circuit, the filter circuit connects the operational amplification circuit, and the rectification circuit connects the filtered electrical
Road, the control circuit connect the rectification circuit.
In one embodiment of the invention, the filter circuit includes：6th resistance, the 7th resistance, the 8th resistance, the 9th electricity
Resistance, the second capacitance, the 3rd capacitance, the 4th capacitance, the 5th capacitance, the second operational amplifier and the 3rd operational amplifier, wherein,
Input terminal of the one end of 6th resistance as the filter circuit, the other end of the 6th resistance, one end and second of the 7th resistance
One end of capacitance is connected, the other end, one end of the 3rd capacitance and the positive input terminal phase of the second operational amplifier of the 7th resistance
Even, the other end of the 3rd capacitance ground connection, the other end of the second capacitance, the 4th capacitance one end, the second operational amplifier output
The negative input end of end and the second operational amplifier is connected, the other end of the 4th capacitance, one end of the 8th resistance and the 5th capacitance
One end be connected, the other end, one end of the 9th resistance and the positive input terminal of the 3rd operational amplifier of the 5th capacitance are connected,
The other end ground connection of nine resistance, the other end of the 8th resistance, the negative input end and the 3rd operational amplifier of the 3rd operational amplifier
Output terminal be connected, and form the output terminal of the filter circuit.
In one embodiment of the invention, the rectification circuit includes：Tenth resistance, the 11st resistance, the 12nd resistance,
13 resistance, the 14th resistance, the 20th resistance, the 21st resistance, four-operational amplifier, the 5th operational amplifier and
6th operational amplifier, wherein, one end, one end of the 12nd resistance of the tenth resistance are connected, and form the rectification circuit
Input terminal, the other end of the 12nd resistance, one end of the 13rd resistance are connected with the positive input terminal of four-operational amplifier, and the tenth
The other end ground connection of three resistance, the other end of the tenth resistance, one end, one end and the 5th of the 14th resistance of the 11st resistance
The negative input end of operational amplifier is connected, the other end ground connection of the 11st resistance, the negative input end of four-operational amplifier, the 4th
The output terminal of operational amplifier is connected with the positive input terminal of the 5th operational amplifier, the other end of the 14th resistance, the 20th electricity
One end of resistance is connected with the output terminal of the 5th operational amplifier, the other end of the 20th resistance, one end of the 21st resistance with
The negative input end of 6th operational amplifier is connected, the positive input terminal of the 6th operational amplifier ground connection, the 21st resistance it is another
End, the output terminal of the 6th operational amplifier are connected, and form the output terminal of the rectification circuit.
In one embodiment of the invention, the control circuit includes：Single-phase power factor correcting analog controller.
In one embodiment of the invention, the single-phase power factor correcting analog controller includes：L4981B control chips.
In one embodiment of the invention, the control circuit further includes：15th resistance, the 16th resistance, the 17th electricity
Resistance, the 18th resistance and the 6th capacitance, wherein, the input terminal of one end of the 15th resistance as the control circuit, the 15th
The other end of resistance is connected with the MULT-OUT pins of the L4981B control chips, one end ground connection of the 16th resistance, and the tenth
The ISENSE pins of the other end of six resistance, one end of the 6th capacitance and the L4981B control chips are connected, the 6th capacitance
The other end, one end of the 17th resistance are connected, and the other end of the 17th resistance and the CA-OUT of the L4981B control chips draw
Foot is connected, and one end of the 18th resistance is connected with the IPK pins of the L4981B control chips, and forms the control circuit
Another input terminal, the other end of the 18th resistance are connected with the UREF pins of the L4981B control chips.
As described above, the single phase power factor correcting circuit of the present invention, has the advantages that：
(1) reduce shunt resistance resistance value, reduce resistance loss power, fever is reduced；
(2) high switching frequency, realizes the effect identical with low switching frequency power factor corrector, can reduce boosting electricity
Sensibility reciprocal, reduces its volume, cost-effective.
Brief description of the drawings
Fig. 1 is shown as the structure diagram of the single phase power factor correcting circuit of one embodiment of the invention.
Fig. 2 is shown as the structure diagram of the single phase power factor correcting circuit of another embodiment of the present invention.
Embodiment
Illustrate embodiments of the present invention below by way of specific instantiation, those skilled in the art can be by this specification
Disclosed content understands other advantages and effect of the present invention easily.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also be based on different viewpoints with application, without departing from
Various modifications or alterations are carried out under the spirit of the present invention.It should be noted that in the case where there is no conflict, following embodiments and implementation
Feature in example can be mutually combined.
It should be noted that the diagram provided in following embodiments only illustrates the basic structure of the present invention in a schematic way
Think, then only the display component related with the present invention rather than component count, shape and size during according to actual implementation in schema
Draw, kenel, quantity and the ratio of each component can be a kind of random change during its actual implementation, and its assembly layout kenel
It is likely more complexity.
Referring to Fig. 1, in order to solve under high switching frequency, single phase power factor correcting circuit power consumption is more, cost height etc. is asked
Topic, the present invention provide the single phase power factor correcting circuit of the low sense low-resistance of new high switching frequency, including：Power circuit 1, inspection
Slowdown monitoring circuit 2, control circuit 3, wherein, power circuit 1 distinguishes connection detection circuit 2 and control circuit 3, becomes for completing AC-DC
Change；Detection circuit 2 connects control circuit 3, for faint current signal to be amplified, afterwards, carries out zero phase-shift filtering and rectification
It is sent to control circuit 3；Control circuit 3 is responsible for carrying out single-phase power factor correcting.
As shown in Fig. 2, in one embodiment, the power circuit 1 is the single-phase AC-DC circuits of booster type, including：First work(
Rate diode D1, the second power diode D2, the 3rd power diode D3, the 4th power diode D4, boost inductance L, power
MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor, metal-oxide half field effect transistor) S1,
Reverse fast recovery diode FRD1, safety capacitance C1, first resistor R1, the 19th resistance R19 and filter capacitor E1, wherein, the
The cathode of one power diode D1, the anode of the second power diode D2, one end and the power firestreak ACL phases of safety capacitance C1
Even, the other end of safety capacitance C1, the 3rd power diode D3 cathodes, the anode and zero-power line of the 4th power diode D4
ACN is connected, anode, the anode of the 3rd power diode D3, one end of first resistor R1 and the boosting of the first power diode D1
One end of inductance L is connected, and forms the cathode of positive output end DCP1, the second power diode D2, the 4th power diode D4
Cathode, one end of the 19th resistance R19, the other end of first resistor R1 are connected, and form negative output terminal DCN1 and be used to connect institute
State the other end of the 3, the 19th resistance R19 of control circuit, one end of power MOSFET S1 is connected and connects with filter capacitor E1 one end
Ground, and form the negative output terminal DCN of power circuit 1, the other end of boost inductance L, the other end of power MOSEFT S1 with reversely
The cathode of fast recovery diode FRD1 is connected, the anode of reverse fast recovery diode FRD1 and the other end phase of filter capacitor E1
Even, and the positive output end DCP of power circuit 1 is formed.
As shown in Fig. 2, in one embodiment, the detection circuit 2 includes：Current Mutual Inductance circuit 201, operational amplification circuit
202, or one or both of filter circuit 203 and rectification circuit 204 can also be included.It should be noted that when detection
When circuit 2 includes one in filter circuit 203 and rectification circuit 204, filter circuit 203 or rectification circuit 204 are connected to fortune
Calculate between amplifying circuit 202 and control circuit 3；When detection circuit 2 includes filter circuit 203 and rectification circuit 204 at the same time, fortune
Amplifying circuit 202, filter circuit 203, rectification circuit 204, control circuit 3 is calculated to be sequentially connected.Below will be with a preferable implementation
Example describes the structure composition and connection relation of each circuit unit in detail：
Current Mutual Inductance circuit 201 includes：Current Transmit 1, second resistance R2, wherein, 1 primary side of Current Transmit
One end be connected with the anode of the 4th power diode D4, the other end and the zero-power line ACN phases of 1 primary side of Current Transmit
Even, one end, second resistance R2 one end of 1 secondary side of Current Transmit are connected to the ground；
Operational amplification circuit 202 includes：3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the first operational amplifier
A1, wherein, one end of 3rd resistor R3 is connected with the other end of the other end of second resistance R2,1 secondary side of Current Transmit,
The other end of 3rd resistor R3 is connected with the positive input terminal of the first operational amplifier A 1, one end ground connection of the 4th resistance R4, and the 4th
The other end of resistance R4, one end of the 5th resistance R5 are connected with the negative input end of the first operational amplifier A 1, the 5th resistance R5's
The other end is connected with the output terminal of the first operational amplifier A 1；
Filter circuit 203 includes：6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the second capacitance
C2, the 3rd capacitance C3, the 4th capacitance C4, the 5th capacitance C5, the second operational amplifier A 2, the 3rd operational amplifier A 3, wherein, the
One end of six resistance R6 is connected with the output terminal of the other end of the 5th resistance R5, the first operational amplifier A 1, the 6th resistance R6's
The other end, one end of the 7th resistance R7, second capacitance C2 one end are connected, the other end of the 7th resistance R7, the one of the 3rd capacitance C3
End is connected with the positive input terminal of the second operational amplifier A 2, the other end ground connection of the 3rd capacitance C3, the other end of the second capacitance C2,
One end of 4th capacitance C4, the output terminal of the second operational amplifier A 2 are connected with the negative input end of the second operational amplifier A 2, the
The other end of four capacitance C4, one end of the 8th resistance R8 are connected with one end of the 5th capacitance C5, the other end of the 5th capacitance C5,
One end of nine resistance R9 is connected with the positive input terminal of the 3rd operational amplifier A 3, and the other end of the 9th resistance R9 is connected to the ground, the
The other end, the negative input end of the 3rd operational amplifier A 3 of eight resistance R8 is connected with the output terminal of the 3rd operational amplifier A 3；
Rectification circuit 204 includes：Tenth resistance R10, the 11st resistance R11, the 12nd resistance R12, the 13rd resistance
R13, the 14th resistance R14, the 20th resistance R20, the 21st resistance R21, four-operational amplifier A4, the 5th operation amplifier
Device A5, the 6th operational amplifier A 6, wherein, one end of the tenth resistance R10, one end and the 3rd computing of the 12nd resistance R12 are put
The output terminal of big device A3 is connected, the other end of the 12nd resistance R12, one end of the 13rd resistance R13 and four-operational amplifier
The positive input terminal of A4 is connected, the other end ground connection of the 13rd resistance R13, the other end, the 11st resistance R11 of the tenth resistance R10
One end, one end of the 14th resistance R14 be connected with the negative input end of the 5th operational amplifier A 5, the 11st resistance R11's is another
One end is grounded, the negative input end of four-operational amplifier A4, the output terminal of four-operational amplifier A4 and the 5th operational amplifier
The positive input terminal of A5 is connected, the other end of the 14th resistance R14, one end of the 20th resistance R20 and the 5th operational amplifier A 5
Output terminal be connected, the other end of the 20th resistance R20, one end of the 21st resistance R21 and the 6th operational amplifier A 6
Negative input end is connected, the positive input terminal ground connection of the 6th operational amplifier A 6, the other end of the 21st resistance R21, the 6th computing
The output terminal of amplifier A6 is connected with control circuit 3.
As shown in Fig. 2, in one embodiment, the control circuit 3 includes：Simulate and control for single-phase power factor correcting
Device, for example, active pfc controller L4981B, using CCM (Continuous Conduction Mode, continuous conduction mode)
With average current detection mode, input current is adjusted by internal voltage and current double closed-loop and tracks input voltage, its work is former
Reason includes：First DC signal is compared with chip internal reference voltage, and difference is as multiplier input signals, multiplier output
Compared with the second DC signal, difference exports pulse by PWM controller, controls power device signal as PWM carrier signals
The break-make of part S1, makes input current signal synchronous with input voltage signal holding, realizes PFC.In an embodiment
In, the control circuit 3 further includes：15th resistance R15, the 16th resistance R16, the 17th resistance R17, the 18th resistance
R18 and the 6th capacitance C6, wherein, one end of the 15th resistance R15 is connected with the output terminal of the 6th operational amplifier A 6, and the tenth
The other end of five resistance R15 is connected with 301 in pin 8 (MULT-OUT) the i.e. figure of control chip L4981B, the 16th resistance
One end ground connection of R16, the other end of the 16th resistance R16, one end of the 6th capacitance C6 and the pin 9 of control chip L4981B
(ISENSE) 302 i.e. in figure are connected, and the other end of the 6th capacitance C6 is connected with one end of the 17th resistance R17, the 17th electricity
The other end of resistance R17 is connected with 303 in pin 5 (CA-OUT) the i.e. figure of control chip L4981B, and the one of the 18th resistance R18
End is connected with 304 in pin 2 (IPK) the i.e. figure of control chip L4981B, the DCN1 ends of the power circuit 1, the 18th electricity
The other end of resistance R18 is connected with 305 in pin 11 (UREF) the i.e. figure of control chip L4981B.
In one embodiment, the type selecting of each device and parameter can be：
Switching frequency：100kHz；
Power device S1：600V, 75A/100 DEG C；
Carborundum fast recovery diode FRD1：600V, 40A/100 DEG C；
Diode rectifier bridge (D1-D4)：600V, 25A/100 DEG C；
Filter capacitor E1：680F, 450V, 3 parallel connections；
Rapid computations amplifier (A1-A6)：AD712,3MHz, ± 15V；
Boost inductance L：0.5mH；
Control chip：L4981B；
Examine leakage resistance R2：5mΩ.
The key principle of the present invention is：
(1) in the case of high-power output, single-phase power factor correcting device is operated in high switching frequency, is not only opened with low
The identical effect of frequency single-phase power factor correcting device is closed, and reduces boost inductance amount and inductance volume, reduces cost of manufacture,
Unidirectional power factor corrector is set to have more practicality.
(2) in the case of high-power output, shunt resistance can produce more losses and heat, and the present invention uses Current Mutual Inductance
Device, detection Current Transformer Secondary side parallel resistance signal, the small-signal detected is put by rapid computations amplifier
It is consistent with data produced by big resistance value shunt resistance greatly and reach same effect；Also, the inspection leakage resistance resistance value that the present invention uses
Reduce, small power consumption fever is few.
(3) in the case of high switching frequency, boost inductor current is in DCM (Discontinuous sometimes
Conduction Mode, discontinuous conduction mode), however, the working method of control chip is CCM, in detection circuit, this
Interrupted current is changed into continuous current by zero phase distortion filter device, is changed into half-sinusoid through precise rectification circuit, is sent to by invention
Control chip, makes control chip be run under CCM, improves power factor.The present invention uses zero phase distortion filter device, makes single-phase power
Factor corrector has novelty.
In conclusion the single phase power factor correcting circuit of the present invention, is switched using single-phase power factor correcting device in height
The strategy of detection circuit is designed in the case of frequency, produces the effect identical with low switching frequency single-phase power factor correcting device, and
And have many advantages, such as reducing inductance and inductance volume, reducing detection resistance, reduce power consumption, is cost-effective, effectively overcome existing
There is the various shortcoming in technology and have high industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe
Know the personage of this technology all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete without departing from disclosed spirit and institute under technological thought such as
Into all equivalent modifications or change, should by the present invention claim be covered.
Claims (10)
- A kind of 1. single phase power factor correcting circuit, it is characterised in that including：Power circuit, for ac signal to be converted into the first DC signal and is exported；Detection circuit, connects the power circuit, and for sampling shunt resistance electric signal according to the ac signal, amplification is simultaneously It is converted into the second DC signal and exports；Control circuit, connects the power circuit and the detection circuit respectively, for according to first DC signal and Second DC signal carries out PFC.
- 2. single phase power factor correcting circuit according to claim 1, it is characterised in that the power circuit includes：Rise The single-phase AC-DC circuits of die mould.
- 3. single phase power factor correcting circuit according to claim 1, it is characterised in that the single-phase AC-DC of booster type Circuit, including：First power diode, the second power diode, the 3rd power diode, the 4th power diode, boosting electricity Sense, power field effect pipe, reverse fast recovery diode, the first capacitance, first resistor and the 19th resistance and filter capacitor, its In, one end of the cathode of the first power diode, the anode of the second power diode and the first capacitance is connected with power firestreak, The anode of the other end of first capacitance, the cathode of the 3rd power diode and the 4th power diode is connected with zero-power line, the The anode of one power diode, the anode of the 3rd power diode, one end of first resistor and one end of boost inductance are connected, And form the first positive output end, the cathode of the second power diode, the cathode of the 4th power diode, the one of the 19th resistance The other end of end and first resistor is connected, and forms the first negative output terminal for being used for connecting the control circuit, the 19th resistance The other end, one end of power field effect pipe is connected and is grounded with one end of filter capacitor, and form the of the power circuit Two negative output terminals, the cathode phase of the other end of boost inductance, the other end of power field effect pipe and reverse fast recovery diode Even, the anode of reverse fast recovery diode is connected with the other end of filter capacitor, and forms the second just defeated of the power circuit Outlet.
- 4. single phase power factor correcting circuit according to claim 3, it is characterised in that the detection circuit includes：Electricity Mutual inductance circuit, operational amplification circuit are flowed, wherein,The Current Mutual Inductance circuit includes：Current transformer, second resistance, wherein, one end of current transformer primary side and the The anode of four power diodes is connected, and the other end of current transformer primary side is connected with zero-power line, Current Transformer Secondary One end of side, one end of second resistance are connected and are grounded；The operational amplification circuit includes：3rd resistor, the 4th resistance, the 5th resistance and the first operational amplifier, wherein, the The other end of one end of three resistance, the other end of second resistance and Current Transformer Secondary side is connected, the other end of 3rd resistor It is connected with the positive input terminal of the first operational amplifier, one end of the 4th resistance ground connection, the other end of the 4th resistance, the 5th resistance The negative input end of one end and the first operational amplifier is connected, the other end of the 5th resistance and the output terminal of the first operational amplifier It is connected, and forms the output terminal of the operational amplification circuit.
- 5. single phase power factor correcting circuit according to claim 4, it is characterised in that the detection circuit further includes： Filter circuit, and/or rectification circuit, wherein,When only including filter circuit, the filter circuit is connected between the operational amplification circuit and the control circuit；When only including rectification circuit, the rectification circuit is connected between the operational amplification circuit and the control circuit；When including filter circuit and during rectification circuit, the filter circuit connects the operational amplification circuit, the rectification circuit The filter circuit is connected, the control circuit connects the rectification circuit.
- 6. single phase power factor correcting circuit according to claim 5, it is characterised in that the filter circuit includes：The Six resistance, the 7th resistance, the 8th resistance, the 9th resistance, the second capacitance, the 3rd capacitance, the 4th capacitance, the 5th capacitance, the second fortune Amplifier and the 3rd operational amplifier are calculated, wherein, the input terminal of one end of the 6th resistance as the filter circuit, the 6th electricity One end of the other end of resistance, one end of the 7th resistance and the second capacitance is connected, the other end of the 7th resistance, the one of the 3rd capacitance The positive input terminal of end and the second operational amplifier is connected, the other end ground connection of the 3rd capacitance, the other end of the second capacitance, the 4th The negative input end of one end of capacitance, the output terminal of the second operational amplifier and the second operational amplifier is connected, the 4th capacitance it is another One end of one end, one end of the 8th resistance and the 5th capacitance is connected, the other end of the 5th capacitance, one end of the 9th resistance and The positive input terminal of three operational amplifiers is connected, the other end ground connection of the 9th resistance, the other end, the 3rd operation amplifier of the 8th resistance The output terminal of the negative input end of device and the 3rd operational amplifier is connected, and forms the output terminal of the filter circuit.
- 7. single phase power factor correcting circuit according to claim 5, it is characterised in that the rectification circuit includes：The Ten resistance, the 11st resistance, the 12nd resistance, the 13rd resistance, the 14th resistance, the 20th resistance, the 21st resistance, Four-operational amplifier, the 5th operational amplifier and the 6th operational amplifier, wherein, one end of the tenth resistance, the 12nd resistance One end is connected, and forms the input terminal of the rectification circuit, the other end of the 12nd resistance, one end and the 4th of the 13rd resistance The positive input terminal of operational amplifier is connected, the other end of the 13rd resistance ground connection, the other end of the tenth resistance, the 11st resistance The negative input end of one end, one end of the 14th resistance and the 5th operational amplifier is connected, the other end ground connection of the 11st resistance, The positive input terminal phase of the negative input end of four-operational amplifier, the output terminal and the 5th operational amplifier of four-operational amplifier Even, the other end of the 14th resistance, one end of the 20th resistance are connected with the output terminal of the 5th operational amplifier, the 20th resistance The other end, one end of the 21st resistance be connected with the negative input end of the 6th operational amplifier, the 6th operational amplifier is just Input end grounding, the other end, the output terminal of the 6th operational amplifier of the 21st resistance are connected, and form the rectification circuit Output terminal.
- 8. single phase power factor correcting circuit according to claim 1, it is characterised in that the control circuit includes：It is single Phase PFC analog controller.
- 9. single phase power factor correcting circuit according to claim 8, it is characterised in that the single-phase power factor correcting Analog controller includes：L4981B control chips.
- 10. single phase power factor correcting circuit according to claim 9, it is characterised in that the control circuit further includes： 15th resistance, the 16th resistance, the 17th resistance, the 18th resistance and the 6th capacitance, wherein, one end of the 15th resistance As the input terminal of the control circuit, the MULT-OUT pins of the other end of the 15th resistance and the L4981B control chips It is connected, one end ground connection of the 16th resistance, the other end of the 16th resistance, one end of the 6th capacitance and L4981B controls The ISENSE pins of chip are connected, and the other end of the 6th capacitance, one end of the 17th resistance are connected, the other end of the 17th resistance It is connected with the CA-OUT pins of the L4981B control chips, one end of the 18th resistance and the L4981B control chips IPK pins are connected, and form another input terminal of the control circuit, and the other end and the L4981B of the 18th resistance are controlled The UREF pins of chip are connected.
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| CN201610946631.1A CN107994764A (en) | 2016-10-26 | 2016-10-26 | Single phase power factor correcting circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610946631.1A CN107994764A (en) | 2016-10-26 | 2016-10-26 | Single phase power factor correcting circuit |
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| CN107994764A true CN107994764A (en) | 2018-05-04 |
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| CN206533279U (en) * | 2016-10-26 | 2017-09-29 | 上海儒竞自动控制系统有限公司 | Single phase power factor correcting circuit |
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Application publication date: 20180504 |