CN112072907A - Bridgeless PFC circuit of currentless sensor - Google Patents
Bridgeless PFC circuit of currentless sensor Download PDFInfo
- Publication number
- CN112072907A CN112072907A CN202010778540.8A CN202010778540A CN112072907A CN 112072907 A CN112072907 A CN 112072907A CN 202010778540 A CN202010778540 A CN 202010778540A CN 112072907 A CN112072907 A CN 112072907A
- Authority
- CN
- China
- Prior art keywords
- diode
- power supply
- mos tube
- alternating current
- inductor
- 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.)
- Granted
Links
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 238000010586 diagram Methods 0.000 description 6
- 238000012937 correction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0012—Control circuits using digital or numerical techniques
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The invention relates to a bridgeless PFC circuit without a current sensor, which comprises an alternating current power supply VSHeating wire, AC power supply VSThe diode D3 and the inductor L1 are connected to the anode of the diode D1 and the drain of the mos tube Q1, and the source of the mos tube Q1 is connected to the alternating current power supply VSForming a loop; the AC power supply VSThe diode D4 and the inductor L2 are connected to the cathode of the diode D2 and the source of the mos tube Q2, and the drain of the mos tube Q2 is connected to the alternating current power supply VSForming a loop; the cathode of the diode D1 and the anode of the diode D2 are both connected to one end of a heating wire, and the other end of the heating wire is connected to an alternating current power supply VSForming a loop. The circuit provided by the invention has good high-power application potential, only two voltage sensors on the alternating current side and the direct current side provide voltage information, current information does not need to be acquired, the circuit complexity is greatly reduced, and the circuit cost is saved.
Description
Technical Field
The invention belongs to the technical field of communication, and particularly relates to a bridgeless PFC circuit of a currentless sensor.
Background
In order to reduce power transmission loss and improve power quality, more and more electronic products are required to include a Power Factor Correction (PFC) function.
The power factor correction technology can realize that the input end of the power supply and the input current track the alternating current input voltage, thereby greatly reducing the reactive power in the power grid and reducing the pollution of the power supply to the power grid.
The existing PFC circuit has the following problems: in a traditional bridgeless PFC circuit, inductor current needs to be sampled to carry out loop control, so that the AC input current is ensured to follow the AC input voltage, and the function of correcting the power factor is realized. The current sensor is not only high in cost, but also more complex because a current acquisition circuit is needed.
Disclosure of Invention
In order to solve the problems, the invention provides a bridgeless PFC circuit without a current sensor, which has good high-power application potential, only two voltage sensors are arranged on an alternating current side and a direct current side to provide voltage information, current information does not need to be acquired, the circuit complexity is greatly reduced, and the circuit cost is saved.
A bridgeless PFC circuit without current sensor comprises an AC power supply VSHeating wire, AC power supply VSThe diode D3 and the inductor L1 are connected to the anode of the diode D1 and the drain of the mos tube Q1, and the source of the mos tube Q1 is connected to the alternating current power supply VSForming a loop; the AC power supply VSThe diode D4 and the inductor L2 are connected to the cathode of the diode D2 and the source of the mos tube Q2, and the drain of the mos tube Q2 is connected to the alternating current power supply VSForming a loop; the cathode of the diode D1 and the anode of the diode D2 are both connected to one end of a heating wire, and the other end of the heating wire is connected to an alternating current power supply VSForming a loop.
Preferably, the electric heating wire heating device further comprises a single chip microcomputer, and the alternating current power supply and the heating wire are connected to the ADC end of the single chip microcomputer through a voltage acquisition circuit.
Preferably, the mos tube Q1 and the mos tube Q2 both adopt N-channel enhanced mos tubes.
Preferably, the gates of the mos tube Q1 and the mos tube Q2 are connected to the PWM output end of the single chip microcomputer.
Preferably, the inductance values of the inductor L1 and the inductor L2 are the same as the equivalent resistance.
Preferably, the forward conduction voltages of the diode D1, the diode D2, the diode D3 and the diode D4 are the same as the conduction voltages of the mos transistor Q1 and the mos transistor Q2.
The invention has the beneficial effects that: this patent designs a PFC circuit that does not need the current sensor. The converter topological structure has good high-power application potential, only two voltage sensors on an alternating current side and a direct current side provide voltage information, current information does not need to be acquired, circuit complexity is greatly reduced, circuit cost is saved, and the converter topological structure is an effective control strategy without the current sensors. In addition, an equivalent single-switch model of the PFC converter is provided, and an effective method is provided for analyzing the characteristics of the converter.
Drawings
Fig. 1 is a schematic circuit diagram of an embodiment of the present invention.
FIGS. 2-5 are schematic circuit diagrams of four operating states according to an embodiment of the present invention.
The arrows in the figure indicate the paths of the circuit in the respective operating states at this time.
Fig. 6 is a model diagram of an equivalent single-pole double-position switch according to an embodiment of the invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, an embodiment of the invention provides a bridgeless PFC circuit without a current sensor, including an ac power source VS(AC Power Using household Circuit), high Power, non-polar load, this embodiment uses heating wire, the AC Power supply VSThe diode D3 and the inductor L1 are connected to the anode of the diode D1 and the drain of the mos tube Q1, and the source of the mos tube Q1 is connected to the AC power supply VSForming a loop; AC power supply VSThe diode D4 and the inductor L2 are connected to the cathode of the diode D2 and the source of the mos tube Q2, and the drain of the mos tube Q2 is connected to the AC power supply VSForming a loop; the cathode of the diode D1 and the anode of the diode D2 are bothIs connected to one end of the heating wire, and the other end of the heating wire is connected to an alternating current power supply VSForming a loop.
The embodiment further comprises a single chip microcomputer, wherein an ADC end of the single chip microcomputer is connected to the alternating current power supply and the heating wire through a voltage acquisition circuit respectively and used for sampling the voltage value of the alternating current power supply and the voltages at two ends of the heating wire.
As an implementation mode of the invention, the mos tube Q1 and the mos tube Q2 both adopt N-channel enhanced mos tubes, and the gates of the mos tube Q1 and the mos tube Q2 are both connected with the PWM output end of the singlechip.
As an embodiment of the present invention, the forward turn-on voltages of the diode D1, the diode D2, the diode D3, and the diode D4 are the same. And the conduction voltages of the mos tube Q1 and the mos tube Q2 are equal to the forward conduction voltage of the diode.
In one embodiment of the present invention, the inductance values and the equivalent resistances of the inductor L1 and the inductor L2 are the same.
The working principle of the invention is as follows: using ac power supply VSThe characteristics of (2) and the structural design of the circuit have the precondition that the inductance values and the equivalent resistances of the inductor L1 and the inductor L2 are equal, the conduction voltages of all diodes and MOS tubes are equal, and the circuit is applied to an alternating current power supply VSThe circuit will present different states in 4 under the constant variation of the voltage, as shown in fig. 2 to 5, the arrows in the figure represent the paths of the circuit under each operating state, and the paths not in the arrow path are open circuits, which are respectively:
state 1: when V isS>When the mos transistor Q1 is turned on and the mos transistor Q2 is turned off at 0, the circuit diagram is as shown in fig. 2.
State 2: when V isS>When the mos transistor Q1 and the mos transistor Q2 are turned off at 0, the circuit is shown in fig. 3.
State 3: when V isS<When the mos transistor Q2 is turned on and the mos transistor Q1 is turned off at 0, the circuit diagram is as shown in fig. 4.
And 4: when V isS<When the mos transistor Q1 and the mos transistor Q2 are turned off at 0, the circuit is as shown in fig. 5.
The inductance voltage was obtained in each state.
State 1: v. ofL，P，ON＝vS-iSrL-2Von(ii) a Formula I
State 2: v. ofL，P，OFF＝vS-iSrL-2Von-VoFormula II
State 3: v. ofL，N，ON＝vS-iSrL+2Von(ii) a Formula III
And 4: v. ofL,N,OFF＝vS-iSrL+2Von+Vo(ii) a Formula IV
Wherein v isSIs the supply voltage iSFor the current flowing through the inductor, rLIs the equivalent resistance of an inductor, VonIs the conduction voltage of the diode and mos tube, VoThe voltage (i.e., the output voltage) at the two ends of the heating wire.
Using operator sign (v)S) The sign of the voltage of the power supply is indicated,
the inductor voltages of equations I-IV can be expressed as:
vL，ON＝vS-iSrL-2sign(vS)Von(ii) a Formula VI
vL，OFF＝vS-iSrL-2sign(vS)Von-sign(vS)Vo(ii) a Formula VII
According to the formula VI and the formula VII, the circuit schematic diagram of the embodiment of the invention can be converted into an equivalent single-pole double-position switch model, as shown in fig. 6.
According to the above model, the on-time and off-time in one switching cycle are duty Ts and (1-duty) Ts, respectively. Since the switching frequency fs is much larger than the gate frequency f, the supply voltage Vs can be seen as a constant value during one switching period Ts-1/fs. The inductor current operates in a continuous current mode.
The time averaging method is adopted according to the average voltage of the inductor:
<vL>＝[vS>-<iS>rL-2sign(vS)Von-sign(vS)Vo(1-duty)](ii) a Formula VIII
Assuming average inductor current<iS>From the formula IX:
is given in
The peak inductor voltage is shown, and ω is the grid frequency.
Because the input voltage and the input current are sinusoidal in phase, the average inductor voltage can be further expressed as:
finally, the following results are obtained:
with the exception of the output voltage V in the above formula XIoAnd voltage VSAre externally known values, in which the output voltage V isoAnd an alternating current supply voltage vSThe ADC end of the singlechip carries out sampling through a voltage acquisition circuit, and the voltage v of the alternating current power supplySThe voltage collected by the singlechip is calculated to restore a positive power supply voltage v and a negative power supply voltage vSSubstituted into formula XI; the electric heating wire is connected to the ADC end of the singlechip after passing through the voltage acquisition circuit, and the singlechip calculates to obtain an output voltage VoMagnitude of (V of the output voltage is only to be understood here)oThe value size neglects the positive and negative directions of the voltage) and is substituted into the formula XI, the duty ratio is finally calculated in the singlechip, and the calculation result is used for the singlechip to doIn order to output the PWM wave, PWM signals are output to the mos tube Q1 and the mos tube Q2 and are used for controlling the switching of the gates of the mos tube Q1 and the mos tube Q2.
The present embodiment can adjust the input voltage and the input current to be in phase and adjust the output voltage V by only adjusting the voltageoRegulated to a reference voltage
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the present invention in its spirit and scope. Are intended to be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A bridgeless PFC circuit of a currentless sensor is characterized by comprising an alternating current power supply VSHeating wire, AC power supply VSThe diode D3 and the inductor L1 are connected to the anode of the diode D1 and the drain of the mos tube Q1, and the source of the mos tube Q1 is connected to the alternating current power supply VSForming a loop; the AC power supply VSThe diode D4 and the inductor L2 are connected to the cathode of the diode D2 and the source of the mos tube Q2, and the drain of the mos tube Q2 is connected to the alternating current power supply VSForming a loop; the cathode of the diode D1 and the anode of the diode D2 are both connected to one end of a heating wire, and the other end of the heating wire is connected to an alternating current power supply VSForming a loop.
2. The bridgeless PFC circuit without the current sensor according to claim 1, further comprising a single chip microcomputer, wherein the alternating current power supply and the heating wire are both connected to an ADC end of the single chip microcomputer through a voltage acquisition circuit.
3. The bridgeless PFC circuit of claim 2, wherein the mos transistor Q1 and the mos transistor Q2 both employ N-channel enhanced mos transistors.
4. The bridgeless PFC circuit without the current sensor according to claim 2, wherein gates of the mos tube Q1 and the mos tube Q2 are connected to a PWM output terminal of a single chip microcomputer.
5. The bridgeless PFC circuit of claim 2, wherein the inductance values and the equivalent resistances of the inductor L1 and the inductor L2 are the same.
6. The bridgeless PFC circuit of claim 2, wherein forward turn-on voltages of the diode D1, the diode D2, the diode D3 and the diode D4 are the same as turn-on voltages of the mos transistor Q1 and the mos transistor Q2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010778540.8A CN112072907B (en) | 2020-08-05 | 2020-08-05 | Bridgeless PFC circuit without current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010778540.8A CN112072907B (en) | 2020-08-05 | 2020-08-05 | Bridgeless PFC circuit without current sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112072907A true CN112072907A (en) | 2020-12-11 |
| CN112072907B CN112072907B (en) | 2024-06-14 |
Family
ID=73657260
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010778540.8A Active CN112072907B (en) | 2020-08-05 | 2020-08-05 | Bridgeless PFC circuit without current sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112072907B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202034900U (en) * | 2011-03-31 | 2011-11-09 | 武汉诚锐电器有限公司 | Correcting circuit with RCD (residual current device) clamping circuit zero-voltage transient active soft switch |
| WO2013078602A1 (en) * | 2011-11-29 | 2013-06-06 | 深圳市核达中远通电源技术有限公司 | Bridgeless power factor correction converter |
| KR20150044333A (en) * | 2013-10-16 | 2015-04-24 | 삼성전자주식회사 | A bridgeless power factor correction circuit and driving method |
| CN110289776A (en) * | 2019-07-30 | 2019-09-27 | 广东工业大学 | The double Boost non-bridge PFC converters of single inductance |
| CN212231333U (en) * | 2020-08-05 | 2020-12-25 | 吉林大学 | Bridgeless PFC circuit of currentless sensor |
-
2020
- 2020-08-05 CN CN202010778540.8A patent/CN112072907B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202034900U (en) * | 2011-03-31 | 2011-11-09 | 武汉诚锐电器有限公司 | Correcting circuit with RCD (residual current device) clamping circuit zero-voltage transient active soft switch |
| WO2013078602A1 (en) * | 2011-11-29 | 2013-06-06 | 深圳市核达中远通电源技术有限公司 | Bridgeless power factor correction converter |
| KR20150044333A (en) * | 2013-10-16 | 2015-04-24 | 삼성전자주식회사 | A bridgeless power factor correction circuit and driving method |
| CN110289776A (en) * | 2019-07-30 | 2019-09-27 | 广东工业大学 | The double Boost non-bridge PFC converters of single inductance |
| CN212231333U (en) * | 2020-08-05 | 2020-12-25 | 吉林大学 | Bridgeless PFC circuit of currentless sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112072907B (en) | 2024-06-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Wei et al. | A novel bridgeless buck-boost PFC converter | |
| CN110365205B (en) | High-efficiency totem-pole bridgeless PFC rectifier control method | |
| CN101976958B (en) | High-efficiency power regulating device based on power factor correction | |
| CN112564475B (en) | DCM control method and device for single-phase staggered parallel totem-pole PFC circuit | |
| CN101197544A (en) | Wide region input and continuously adjustable non-bridge Buck-Boost PFC converter | |
| CN110190752B (en) | Bidirectional CLLLC-DCX resonant converter and control method thereof | |
| CN105024545A (en) | Switch control method, ON-OFF control circuit and modulator | |
| CN105553249A (en) | Current injection type three-phase power factor correction circuit having wide voltage range and low voltage stress | |
| CN114448249A (en) | Full-digital soft switching control circuit of four-switch buck-boost bidirectional converter | |
| CN110445387B (en) | Topological structure and control method of formation and grading power supply | |
| Rajakumari et al. | Comparative analysis of DC-DC converters | |
| CN115642805A (en) | ZVS-based six-switch buck-boost converter | |
| CN115065244A (en) | Control circuit and optimization method of four-switch buck-boost converter | |
| CN205490142U (en) | Switched inductor boost converter | |
| CN212231333U (en) | Bridgeless PFC circuit of currentless sensor | |
| CN114448248A (en) | Control circuit of coupling inductor interleaved parallel four-switch buck-boost bidirectional converter | |
| Srivastava et al. | A modified duty cycle frequency control soft switching of full bridge DC-DC converter for electric vehicle battery charging | |
| CN204886731U (en) | Switching power supply controller and contain switching power supply of this switching power supply controller | |
| Revko et al. | Stepwise pulse-width modulation in quasi-resonant pulsed converters using switched capacitors | |
| CN106787756B (en) | A kind of CL-FT-CL resonance DC converter | |
| CN112054673A (en) | Soft switching buck converter circuit and control method thereof | |
| CN112072907B (en) | Bridgeless PFC circuit without current sensor | |
| CN109245516B (en) | A kind of active PFC numerical control device | |
| CN203434855U (en) | Control circuit applied to power factor correction circuit | |
| CN216216584U (en) | Buck-boost inverter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |