CN206533279U - Single phase power factor correcting circuit - Google Patents
Single phase power factor correcting circuit Download PDFInfo
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- CN206533279U CN206533279U CN201621170969.4U CN201621170969U CN206533279U CN 206533279 U CN206533279 U CN 206533279U CN 201621170969 U CN201621170969 U CN 201621170969U CN 206533279 U CN206533279 U CN 206533279U
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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Abstract
The utility model provides high switching frequency low sense low-resistance single phase power factor correcting circuit, including：Power cell, detection unit, control unit.Power cell is the single-phase AC DC circuits of booster type, and detection unit is responsible for that control unit will be sent to after faint current signal linear amplification, and control unit is single-phase power factor correcting analog controller.In the case of high-power output, single-phase power factor correcting device of the present utility model is operated in high switching frequency, not only with low switching frequency single-phase power factor correcting device identical effect, and reduce boost inductance amount and inductance volume.Meanwhile, the operational amplifier in detection unit amplifies faint inductor current signal, can reduce shunt resistance resistance, reduces power consumption, reduces heating.
Description
Technical field
The utility model is related to single-phase power factor correcting technology, the PFC of more particularly to high-power output
Device technology, and in particular to reduce the circuit that power consumption realizes PFC under high switching frequency.
Background technology
In single-phase power network, with the fast development of Power Electronic Technique, increasing power electronic equipment is in power network
In come into operation, especially with switching power circuit and the ac-dc-ac inverter electricity of rectifier bridge and electrochemical capacitor as front stage circuits
Widely using for road, serious harmonic current pollution is caused to power network.APFC（APFC）Technology turns into solution
The important technology that certainly harmonic current pollutes.
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 it is big, power consumption is more, and heating is serious.To improve switching frequency, shunt resistance
More power consumptions and heat can be produced.Come accordingly, it would be desirable to look for the low sense low-resistance single phase power factor correcting circuit of high switching frequency
Solve these problems.
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
Generally it can also produce bigger power consumption, send more heats, it is impossible to meeting the demand of practical application.
Utility model content
The shortcoming of prior art in view of the above, the purpose of this utility model is to provide new 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 utility model provides single phase power factor correcting circuit, including：
Power cell, for ac signal to be converted into the first DC signal and exported；Detection unit, connects the power list
Member, for sampling shunt resistance electric signal according to the ac signal, is amplified and converted to the second DC signal and exports；
Control unit, connects the power cell and the detection unit respectively, for according to first DC signal and described
Second DC signal carries out PFC.
In the embodiment of the utility model one, the power cell includes：The single-phase AC-DC circuits of booster type.
In the embodiment of the utility model one, the single-phase AC-DC circuits of booster type include：First power diode,
Two power diodes, the 3rd power diode, the 4th power diode, boost inductance, reversely power field effect pipe, fast recovery two
Pole pipe, the first electric capacity, first resistor, second resistance, the second electric capacity, wherein, the positive pole of the first power diode, the second power two
The negative pole of pole pipe, one end of the first electric capacity are connected with power firestreak, and the other end of the first electric capacity, the 3rd power diode are just
Pole, the negative pole of the 4th power diode are connected with zero-power line, and the positive pole of the second power diode, the 4th power diode are just
Pole, one end of first resistor, one end of second resistance are connected, the negative pole of the first power diode, the 3rd power diode it is negative
Pole, the other end of first resistor, one end of boost inductance be connected, and the other end of boost inductance, power field effect pipe drain, instead
Positive pole to fast extensive diode is connected, and the other end of second resistance, the source electrode of power field effect pipe, one end of the second electric capacity are connected
Constitute the cathode output end of the power cell, the negative pole of reverse fast recovery diode is connected composition with the other end of the second electric capacity
The cathode output end of the power cell.
In the embodiment of the utility model one, the detection unit includes：Operational amplifier, 3rd resistor, the 4th resistance,
5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, electric capacity, wherein, one end of 3rd resistor is connected with first resistor
One end of two resistance is connected, and the other end of 3rd resistor is connected with the positive input terminal of operational amplifier, one end of the 4th resistance, the
One end of five resistance, the reverse input end of operational amplifier are connected, the other end of the 4th resistance ground connection, one end of the 7th resistance with
The output end of operational amplifier is connected, and the other end of the 7th resistance is connected with described control unit, the other end of the 5th resistance and
The output end of operational amplifier is connected, and one end of the 6th resistance is connected with one end of the second capacity earth, the 6th resistance it is another
End, one end of the 8th resistance are connected with described control unit, and the other end of the 8th resistance is connected with one end of the 3rd electric capacity, and the 3rd
The other end of electric capacity is connected with described control unit.
In the embodiment of the utility model one, described control unit includes：Single-phase power factor correcting analog controller.
In the embodiment of the utility model one, the single-phase power factor correcting analog controller includes：L4981B is controlled
Chip.
In the embodiment of the utility model one, the pin 8 of the L4981B chips is connected with the other end of the 7th resistance, institute
The pin 9 for stating L4981B chips is connected to the tie point of the 6th resistance and the 8th resistance, the pin 5 of the L4981B chips and
Three electric capacity are connected, the pin 2 of the L4981B chips, one end of 3rd resistor access second resistance, one end phase of the 9th resistance
Even, the other end of the 9th resistance is connected with the pin 11 of the L4981B chips.
As described above, single phase power factor correcting circuit of the present utility model, is designed using in the case of high switching frequency
The strategy of circuit is detected, is had the advantages that：
（1）Reduce shunt resistance resistance, reduce resistance loss power, heating is reduced；
（2）Switching frequency is improved, is realized and low switching frequency circuit of power factor correction identical effect, and electricity can be reduced
Sensibility reciprocal, reduces inductance volume, cost-effective.
Brief description of the drawings
Fig. 1 is shown as the structural representation of the single phase power factor correcting circuit of the embodiment of the utility model one.
Fig. 2 is shown as the structural representation of the single phase power factor correcting circuit of another embodiment of the utility model.
Embodiment
Illustrate embodiment of the present utility model below by way of specific instantiation, those skilled in the art can be by this theory
Content disclosed by bright book understands other advantages of the present utility model and effect easily.The utility model can also be by addition
Different embodiments are embodied or practiced, and the various details in this specification can also be based on different viewpoints with answering
With, without departing from it is of the present utility model spirit under carry out various modifications or alterations.It should be noted that, in situation about not conflicting
Under, the feature in following examples and embodiment can be mutually combined.
It should be noted that the diagram provided in following examples only illustrates of the present utility model basic in a schematic way
Conception, then in schema only display with relevant component in the utility model rather than according to component count during actual implement, shape
And size is drawn, it is actual when implementing, and kenel, quantity and the ratio of each component can be a kind of random change, and its assembly layout
Kenel may also be increasingly complex.
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 utility model provides new single phase power factor correcting circuit, including：Power cell 1, detection unit 2, control unit
3, wherein, the connecting detection unit 2 of power cell 1 and control unit 3, for completing AC-DC conversion；The connection control of detection unit 2
Unit 3, for control unit 3 will to be sent to after faint current signal linear amplification；Control unit 3 is used to complete input current
Track input voltage.
Referring to Fig. 2, in one embodiment, power cell 1 is the single-phase AC-DC circuits of booster type, including：First power two
Pole pipe 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 electric capacity C1, first resistor R1, second resistance R2, filter capacitor E1.Specifically, first
Power diode D1 positive pole, the second power diode D2 negative pole, safety electric capacity C one end are connected with power firestreak ACL, peace
The rule electric capacity C other ends, the 3rd power diode D3 positive poles, the 4th power diode D4 negative pole are connected with zero-power line ACN, the
Two power diode D2 positive pole, the 4th power diode D4 positive pole, first resistor R1 one end, second resistance R2 one end phase
Even, negative pole, the 3rd power diode D3 negative pole, the first resistor R1 for constituting input DCN1, the first power diode D1 are another
One end is connected with boost inductance L one end, constitutes input DCP1, the boost inductance L other end, power MOSFET S1 drain electrode
It is connected with reverse fast extensive diode FRD1 positive pole, the second resistance R2 other ends, power MOSFET S1 source electrode and filter capacitor
E1 one end, which is connected, constitutes power circuit cathode output end DCN2, and reverse fast recovery diode FRD1 negative poles and filter capacitor E1 are another
End, which is connected, constitutes cathode output end DCP2.
Referring to Fig. 2, in one embodiment, the detection circuit 2 includes：Operational amplifier A, 3rd resistor R3, the 4th
Resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, electric capacity C3.Specifically：3rd resistor R3 mono-
One end that end is connected second resistance R2 with first resistor R1 is connected, the positive input of the 3rd resistor R3 other ends and operational amplifier A
End is connected, and the 4th resistance R4, the 5th resistance R5 one end are connected with the reverse input end of operational amplifier A, and the 4th resistance R4 is another
End ground connection, the 7th resistance R7 one end is connected with the output end of operational amplifier A, the 7th resistance R7 other ends and the phase of control unit 3
Even, the 5th resistance R5 other ends are connected with the output end of operational amplifier A, and the 6th resistance R6 one end is grounded with filter capacitor E1
One end be connected, the 6th resistance R6 other ends, the 8th resistance R8 one end are connected with control unit 3, the 8th resistance R8 other end and
Electric capacity C3 one end is connected, and the electric capacity C3 other end is connected with control unit 3.
Referring to Fig. 2, in one embodiment, the control chip 3 is single-phase power factor correcting analog controller, example
Such as, active pfc controller L4981B, using CCM（Continuous Conduction Mode, continuous conduction mode）With being averaged
Current detecting mode, adjusts input current by internal voltage and current double closed-loop and tracks input voltage, its operation principle includes：
First DC signal is compared with chip internal reference voltage, difference as multiplier input signals, multiplier output signal with
Second DC signal compares, and difference exports pulsed power device S1's as PWM carrier signals by PWM controller
Break-make.Make input current signal synchronous with input voltage signal holding, realize PFC.Specifically：Control chip
L4981B pin 8（MULT-OUT）301 i.e. in figure are connected with the 7th resistance R7 other ends, control chip L4981B pin
9（ISENSE）302 i.e. in figure are connected to the 6th resistance R6 and the 8th resistance R8, control chip L4981B pin 5（CA-
OUT）303 i.e. in figure are connected with electric capacity C3,3rd resistor R3 access second resistances R2 one end, control chip L4981B pins
2（IPK）One end of the 304, the 9th resistance R9 i.e. in figure is connected, the 9th resistance the R9 other end and control chip L4981B pins
11（VREF）305 i.e. in figure are connected.
In one embodiment, the type selecting and parameter of each device 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；
Noninductive resistance R2：2mΩ；
Rapid computations amplifier A：Model AD712,3MHZ, ± 15V；
Boost inductance L：0.5mH；
Control chip：L4981B.
Key principle of the present utility model 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
Frequency single-phase power factor correcting device identical effect is closed, and reduces boost inductance amount and inductance volume, cost of manufacture is reduced.
（2）In the case of high-power output, shunt resistance can produce more losses and heat, and the utility model is in detection electricity
Be sent to after the small-signal detected is amplified by rapid computations amplifier in road in control chip, transmitted data with it is big
Resistance shunt resistance sends data unanimously and reaches same effect, and the shunt resistance resistance used reduces, and small power consumption heating is few.
In summary, single phase power factor correcting circuit of the present utility model, height is operated in the case of high-power output
Switching frequency, not only with low switching frequency single phase power factor correcting circuit identical effect, can also reduce boost inductance
Amount and inductance volume；Meanwhile, the operational amplifier in detection circuit amplifies faint inductor current signal, can reduce shunt resistance
Resistance, reduces power consumption, reduces heating, effectively overcomes various shortcoming of the prior art and have high industrial utilization.
Above-described embodiment only illustrative principle of the present utility model and its effect are new not for this practicality is limited
Type.Any person skilled in the art can all be carried out without prejudice under spirit and scope of the present utility model to above-described embodiment
Modifications and changes.Therefore, such as those of ordinary skill in the art without departing from the essence disclosed in the utility model
God and all equivalent modifications completed under technological thought or change, should be covered by claim of the present utility model.
Claims (7)
1. a kind of single phase power factor correcting circuit, it is characterised in that including：
Power cell, for ac signal to be converted into the first DC signal and exported；
Detection unit, connects the power cell, 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 unit, connects the power cell and the detection unit 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 cell includes：Rise
The single-phase AC-DC circuits of die mould.
3. single phase power factor correcting circuit according to claim 2, it is characterised in that the single-phase AC-DC of booster type
Circuit includes：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 electric capacity, first resistor, second resistance, the second electric capacity, wherein, the
One end of the positive pole of one power diode, the negative pole of the second power diode and the first electric capacity is connected with power firestreak, the first electricity
The negative pole of the other end of appearance, the positive pole of the 3rd power diode and the 4th power diode is connected with zero-power line, the second power
The positive pole of diode, the positive pole of the 4th power diode, one end of first resistor, one end of second resistance are connected, the first power
The negative pole of diode, the negative pole of the 3rd power diode, the other end of first resistor, one end of boost inductance are connected, boosting electricity
The other end of sense, the draining of power field effect pipe, the positive pole of reverse fast recovery diode is connected, the other end, the work(of second resistance
The source electrode of rate FET, one end of the second electric capacity, which are connected, constitutes the cathode output end of the power cell, reversely fast to recover two
The negative pole of pole pipe is connected with the other end of the second electric capacity constitutes the cathode output end of the power cell.
4. single phase power factor correcting circuit according to claim 3, it is characterised in that the detection unit includes：Fortune
Amplifier, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, electric capacity are calculated, wherein, the 3rd
One end that one end of resistance is connected second resistance with first resistor is connected, the other end of 3rd resistor and operational amplifier it is just defeated
Enter end to be connected, one end of the 4th resistance, one end of the 5th resistance, the reverse input end of operational amplifier are connected, the 4th resistance
The other end is grounded, and one end of the 7th resistance is connected with the output end of operational amplifier, the other end of the 7th resistance and the control
Unit is connected, and the other end of the 5th resistance is connected with the output end of operational amplifier, and one end and the second electric capacity of the 6th resistance connect
The one end on ground is connected, and the other end of the 6th resistance, one end of the 8th resistance are connected with described control unit, the 8th resistance it is another
End is connected with one end of the 3rd electric capacity, and the other end of the 3rd electric capacity is connected with described control unit.
5. single phase power factor correcting circuit according to claim 4, it is characterised in that described control unit includes：It is single
Phase PFC analog controller.
6. single phase power factor correcting circuit according to claim 5, it is characterised in that the single-phase power factor correcting
Analog controller includes：L4981B control chips.
7. single phase power factor correcting circuit according to claim 6, it is characterised in that the pin of the L4981B chips
8 are connected with the other end of the 7th resistance, and the pin 9 of the L4981B chips is connected to the connection of the 6th resistance and the 8th resistance
Point, the pin 5 of the L4981B chips is connected with the 3rd electric capacity, the pin 2 of the L4981B chips, 3rd resistor access second
One end of resistance, one end of the 9th resistance are connected, and the other end of the 9th resistance is connected with the pin 11 of the L4981B chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621170969.4U CN206533279U (en) | 2016-10-26 | 2016-10-26 | Single phase power factor correcting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621170969.4U CN206533279U (en) | 2016-10-26 | 2016-10-26 | Single phase power factor correcting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206533279U true CN206533279U (en) | 2017-09-29 |
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ID=59922134
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621170969.4U Active CN206533279U (en) | 2016-10-26 | 2016-10-26 | Single phase power factor correcting circuit |
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| CN (1) | CN206533279U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107994764A (en) * | 2016-10-26 | 2018-05-04 | 上海儒竞自动控制系统有限公司 | Single phase power factor correcting circuit |
-
2016
- 2016-10-26 CN CN201621170969.4U patent/CN206533279U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107994764A (en) * | 2016-10-26 | 2018-05-04 | 上海儒竞自动控制系统有限公司 | Single phase power factor correcting circuit |
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