CN103825445B - The Bridgeless power factor controller of AC-DC converter - Google Patents
The Bridgeless power factor controller of AC-DC converter Download PDFInfo
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- CN103825445B CN103825445B CN201210464968.0A CN201210464968A CN103825445B CN 103825445 B CN103825445 B CN 103825445B CN 201210464968 A CN201210464968 A CN 201210464968A CN 103825445 B CN103825445 B CN 103825445B
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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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Abstract
The present invention provides a kind of Bridgeless power factor controller of AC-DC converter, and it at least includes：Detection unit, for the ac signal of the input of the converter to be carried out into step-down rectifier processing, to obtain the first detection electric signal；It regard the current signal of first controlled switch detected and the current signal sum of the second controlled switch as the described second detection electric signal；And the 3rd detection electric signal of the detection output end over the ground；Control unit, for determining the electric signal of the inductance based on the described first detection electric signal, the second detection electric signal, the 3rd detection electric signal；And loop control calculating is carried out using the electric signal of the inductance, the first detection electric signal, the second detection electric signal and the 3rd detection electric signal, to obtain controlled quentity controlled variable；And the dutycycle of pulse signal is changed based on the controlled quentity controlled variable；And the pulse signal is transported into first controlled switch and the second controlled switch.
Description
Technical field
The present invention relates to a kind of power factor controller, more particularly to a kind of AC-DC converter without bridge power because
Number controller.
Background technology
With the popularization and application of frequency-conversion domestic electric appliances, single phase ac DC converter has obtained largely using.It is traditional based on two
The single phase ac DC converter of pole pipe rectifier bridge belongs to nonlinear load, if without PFC（PFC）, will
Aggravate the harmonic current pollution in power network.Just because of suppression harmonic current so that power factor correction technology has been obtained extensively
Research and application.Traditional Bridgeless power factor correction controller is using the measuring circuit such as various sensors and its detection circuit
Information, particularly：Inductive current, input ac voltage and output DC voltage.And excessive sensor and detection circuit increase
Circuit complexity, while reduce the reliability of circuit.
In order to reduce circuit complexity, present Bridgeless power factor controller is also by detecting the inspection stream that direct current negative pole goes out
The pressure drop of resistance determines the waveform of inductive current, and although this kind of mode reduce the use of sensor, but its detection mode mistake
In simple, the transfer energy in inductance can accurately not be adjusted so that AC-DC converter is defeated when by external interference
Go out unstable.Therefore need to be improved existing Bridgeless power factor controller.
The content of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide a kind of nothing of AC-DC converter
Bridge power factor controller, detection circuit complexity and its power factor for solving AC-DC converter in the prior art
The problem of controlling inaccurate.
In order to achieve the above objects and other related objects, the present invention provide a kind of AC-DC converter without bridge power because
Number controller, the AC-DC converter at least includes：The inductance that is connected with the live wire of input, with the inductance connection
First controlled switch, the second controlled switch being connected with the zero line of the input, and with first controlled switch and
The output end of two controlled switch connection, wherein, first controlled switch and second controlled switch are by same pulse signal
Control, wherein, Bridgeless power factor controller at least includes：Detection unit, for by the exchange telecommunications from the input
Number step-down rectifier processing is carried out, electric signal is detected with obtain match with the ac signal of the input first；Detection institute
The current signal of the first controlled switch and the current signal sum of the second controlled switch are stated, and regard described and value as described second
Detect electric signal；And the 3rd detection electric signal of the detection output end over the ground；Control unit, for based on the described first inspection
Electric signal, the second detection electric signal, the 3rd detection electric signal is surveyed to determine the electric signal of the inductance；And utilize the inductance
Electric signal, the first detection electric signal, the second detection electric signal and the 3rd detection electric signal calculate to carry out loop control, with
Obtain controlled quentity controlled variable；And the dutycycle of pulse signal is changed based on the controlled quentity controlled variable；And transport to the pulse signal described
First controlled switch and the second controlled switch, so that first controlled switch and second controlled is opened based on the pulse signal
Control carries out break-make.
Preferably, the detection unit includes：The first detection circuit being connected with the live wire and zero line, it includes：With
The transformer of the live wire and zero line connection, the rectifier being connected with the transformer, multiple the be connected with the rectifier
One resistance, and the first electric capacity being connected with the first resistor of ground connection.
Preferably, the detection unit also includes：Is connected with first controlled switch and second controlled switch
Two detection circuits, it includes：Two second resistances of correspondence connection first controlled switch and the second controlled switch, Mei Geyang
Extremely correspond to the diode of one second resistance of connection, and the grounding resistance being connected with diode cathode each described；
Wherein, the negative electrode of two diodes is connected.
Preferably, the detection unit also includes：The three testing circuit being connected with the output end, it includes：With institute
State the 3rd resistor of the load connection of output end.
Preferably, described control unit includes：The input voltage computing module being connected with the first resistor of ground connection, is used
In instantaneous voltage and voltage effective value that the input is calculated based on the first detection electric signal detected.
Preferably, described control unit also includes：The output voltage computing module being connected with the 3rd resistor, for base
The instantaneous voltage of the output end is calculated in the 3rd detection electric signal detected.
Preferably, described control unit also includes：Inductive current computing module, for the voltage wink using the input
Duration, the second detection electric signal and the 3rd circuit formula that is constituted of detection electric signal calculate the electric current of the inductance
Instantaneous value.
Preferably, described control unit also includes：Corrective control module, for instantaneous using the electric current comprising the inductance
The circuit of the voltage effective value of value, the instantaneous voltage of the output end, the instantaneous voltage of the input and input is public
Formula is controlled calculating to the AC-DC converter, and the result based on calculating changes the dutycycle of pulse signal.
As described above, the Bridgeless power factor controller of the AC-DC converter of the present invention, has the advantages that：
The detection electricity for the input, two controlled switch and output end for handling to detect AC-DC converter using decompression, rectification etc.
Signal, can effectively reduce the sensor being arranged on the AC-DC converter, effectively simplify AC/DC transfer
The circuit complexity of device；Meanwhile, utilize detected electric signal to pass through mathematical computations and control circuit to change pulse signal
Dutycycle, the break-make of two controlled switch in AC-DC converter can be controlled in real time, exactly, so as to the exchange
DC converter remains to export stabilized power source when by external interference.
Brief description of the drawings
Fig. 1 is shown as the structural representation of the Bridgeless power factor controller of the AC-DC converter of the present invention.
Fig. 2 is shown as a kind of knot of preferred embodiment of the Bridgeless power factor controller of the AC-DC converter of the present invention
Structure schematic diagram.
Component label instructions
1 Bridgeless power factor controller
11 detection units
111 first detection circuits
112 second detection circuits
113 three testing circuits
12 control units
121 input voltage computing modules
122 output voltage computing modules
123 inductive current computing modules
124 Corrective control modules
2 AC-DC converters
21 inputs
22 inductance
23 first controlled switch
24 second controlled switch
25 output ends
Embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation
Content disclosed by book understands other advantages and effect of the present invention easily.
Fig. 1 is referred to Fig. 2.It should be clear that structure, ratio, size depicted in this specification institute accompanying drawings etc., is only used to
Coordinate the content disclosed in specification, so that those skilled in the art is understood with reading, being not limited to the present invention can be real
The qualifications applied, therefore do not have technical essential meaning, the tune of the modification of any structure, the change of proportionate relationship or size
It is whole, in the case where not influenceing effect of the invention that can be generated and the purpose that can reach, all should still it fall in disclosed skill
Art content is obtained in the range of covering.Meanwhile, in this specification it is cited as " on ", " under ", "left", "right", " centre " and
The term of " one " etc., is merely convenient to understanding for narration, and is not used to limit enforceable scope of the invention, its relativeness
It is altered or modified, under without essence change technology contents, when being also considered as enforceable category of the invention.
As shown in figure 1, the present invention provides a kind of Bridgeless power factor controller 1 of AC-DC converter, for real-time
The AC-DC converter 2 is controlled, so that the output galvanic current of the AC-DC converter 2 source.Wherein, it is described to hand over
Stream DC converter 2 at least includes：Input 21, the inductance 22 being connected with the live wire of the input 21 and the inductance 22
The first controlled switch 23, the second controlled switch 24 that is connected with the zero line of the input 21 of connection, and with described first
The output end 25 of the controlled switch 24 of controlled switch 23 and second connection.Wherein, first controlled switch 23 and second is controlled opens
24 are closed to be controlled by same pulse signal.
The Bridgeless power factor controller 1 at least includes：Detection unit 11 and control unit 12.
The detection unit 11 is used to the ac signal from the input 21 carrying out step-down rectifier processing, with
The the first detection electric signal matched to the ac signal with the input 21；Detect the electric current of first controlled switch 23
The current signal sum of signal and the second controlled switch 24, and it regard described and value as the described second detection electric signal；And inspection
Go out the 3rd detection electric signal of the output end 25 over the ground.
Wherein, the first detection electric signal, the second detection electric signal and the 3rd detection electric signal are the detection unit
11 weak electric signals detected from the AC-DC converter 2.It includes but is not limited to：Voltage signal, current signal.
Specifically, as shown in Fig. 2 the detection unit 11 includes：First detection module, the second detection module and the 3rd inspection
Survey module.
The first detection circuit 111 is connected with the live wire and zero line, and it includes：It is connected with the live wire and zero line
Transformer, the rectifier being connected with the transformer, the multiple first resistors being connected with the rectifier, and the institute with ground connection
State first resistor and the first electric capacity even.Wherein, the first detection circuit 111 is detected by the first resistor being grounded
First detection electric signal.
The second detection circuit 112 is connected with first controlled switch 23 and second controlled switch 24, and it is wrapped
Include：Two second resistances of the correspondence connection controlled switch 24 of the first controlled switch 23 and second, each anode correspondence is connected
The diode of one second resistance, and the grounding resistance being connected with diode cathode each described.Wherein, two institutes
The negative electrode for stating diode is connected.The second detection circuit 112 is by grounding resistance detection the second detection telecommunications
Number.
The three testing circuit 113 is connected with the output end 25, and it includes：The 3rd be connected with the output end 25
Resistance.Wherein, the 3rd resistor is load resistance, can be one or multiple, in the present embodiment, the described 3rd
Resistance is multiple, and the three testing circuit 113 is by 3rd resistor detection the 3rd detection electric signal.
Described control unit 12 is used for based on the described first detection electric signal, the second detection electric signal, the 3rd detection telecommunications
Number determine the electric signal of the inductance；And utilize the electric signal of the inductance, the first detection electric signal, the second detection electricity
Signal and the 3rd detection electric signal calculate to carry out loop control, to obtain controlled quentity controlled variable；And arteries and veins is changed based on the controlled quentity controlled variable
Rush signal（PWM）Dutycycle；And the pulse signal is transported into the controlled switch 24 of the first controlled switch 23 and second,
The control opened so that first controlled switch 23 and second is controlled based on the pulse signal carries out break-make.Wherein, the control
Unit 12 processed can carry out the circuit or intelligent electronic device of massive values computation, its hardware bag to be a kind of according to default program
Include but be not limited to：CPU, DSP etc..
Specifically, described control unit 12 is based on default circuit formula, and utilize detected first detect electric signal,
Second detects electric signal and the 3rd detection electric signal to obtain the electric signal in the inductance；Recycle current inner loop control electricity
Electric signal to the inductance, the first detection electric signal, the second detection electric signal and the are come in road, outer voltage control circuit
Three detection electric signals carry out loop control, to obtain controlled quentity controlled variable, and the controlled quentity controlled variable are compared with default sawtooth waveforms, when
On the contrary the instantaneous value of the controlled quentity controlled variable is more than the instantaneous value of the sawtooth waveforms, then exports high level, then export low level, so
Change the dutycycle of pulse signal, then be supplied to first controlled switch 23 and second controlled the pulse signal of output
Switch 24, thus changes the make-and-break time of the controlled switch 24 of the first controlled switch 23 and second.
Preferably, described control unit 12 includes：Input voltage computing module 121, output voltage computing module 122, electricity
Inducing current computing module 123, Corrective control module 124.
The input voltage computing module 121 is connected with the first resistor being grounded, for based on first detected
Detect that electric signal calculates the instantaneous voltage and voltage effective value of the input 21.For example, the input voltage computing module
121 include RMS to DC circuit and instantaneous value detection circuit.
The output voltage computing module 122 is connected with the 3rd resistor, for based on the 3rd detection electricity detected
The instantaneous voltage of output end 25 described in signal of change.For example, the output voltage computing module 122 is examined including instantaneous voltage
Slowdown monitoring circuit.
The inductive current computing module 123 is used to utilize the instantaneous voltage of the input 21, second detection
Circuit formula that electric signal and the instantaneous voltage of the output end 25 are constituted calculates the current instantaneous value of the inductance.Its
In, the hardware of the inductive current computing module 123 includes but is not limited to：The fortune designed based on default inductance calculation formula
Calculate circuit or the circuit comprising CPU etc..
Specifically, the second detection electric signal that the inductive current computing module 123 is detected is voltage signal, then is based on
The voltage signal and the resistance of the ground connection in the second detection circuit detect the crystalline substance flowed through in first controlled switch
Current instantaneous value when body pipe is just turned off and just turned on, and obtain the instantaneous voltage of the input and the electricity of output end
Press instantaneous value；Formula is based on again：L=VL/(diL/dt)、iD=iD0-(Uout-Uin)t/L、iS=iS0+UinT/L and iL=iS+iDTo count
Calculate the current instantaneous value in the inductance.Wherein, VLFor inductance terminal voltage, iLFor inductive current instantaneous value, diLFor inductive current
Variable quantity, dt is time variation amount；iDFor the current instantaneous value of the diode；iD0For described second in each switch periods
Current instantaneous value when transistor in controlled switch is just turned off；UoutThe output voltage computing module 122 is detected
Export DC voltage instantaneous value；UinThe input sinusoidal half-wave voltage instantaneous value detected for the input voltage computing module 121；
T is the time；L is the inductance value of the inductance calculated；iS0For the transistor in first controlled switch in each switch periods
Current instantaneous value when just turning on；iLFor the current instantaneous value in the inductance.In fact, the Corrective control module is sent
The pulse signal of one fixed width, and deliver to first controlled switch and the respective gate driver of the second controlled switch, two
Controlled switch only one of which turn on, when inductance is by power network short circuit, on inductance formed a current impulse, the current impulse it is upper
Rise is exactly diL, the rise time of the current impulse is exactly dt.
The Corrective control module 124 is used for current instantaneous value, the voltage wink of the output end 25 for utilizing the inductance
The voltage effective value of duration, the instantaneous voltage of the input 21 and input 21 enters to the AC-DC converter 2
Row Corrective control is calculated, to obtain controlled quentity controlled variable, and changes the dutycycle of pulse signal based on the controlled quentity controlled variable.Wherein, it is described
Corrective control module 124 can include arithmetic unit, CPU circuit.
For example, the instantaneous voltage of the output end is compared with output voltage values given inside the controller
Afterwards, PI regulation controls are taken, outer voltage controlled quentity controlled variable is obtained.Outer voltage controlled quentity controlled variable is multiplied by input voltage instantaneous value and divided by defeated
Enter voltage effective value square after obtain inductive current set-point.The electric current of inductance of the inductive current set-point with detecting is instantaneous
Value compare gained difference carry out PI regulation control after, obtain ultimate current inner ring controlled quentity controlled variable.Current inner loop control amount and carrier wave
Compare and obtain original pwm pulse sequence, the pulse train delivers to the gate pole of power circuit so that power device after overdriving
Part carries out on-off action, forces and inductive energy storage and releases energy, and completes power factor emendation function, realize unit input power because
Number and stable VD.
It should be noted that it should be appreciated by those skilled in the art that above-mentioned Corrective control module 124 utilizes the inductance
Current instantaneous value, the instantaneous voltage of the output end 25, the voltage of the instantaneous voltage of the input 21 and input 21
Virtual value is only for example to be corrected the mode that control is calculated to the AC-DC converter 2, rather than to the limit of the present invention
System.
In summary, the Bridgeless power factor controller of AC-DC converter of the invention, utilizes decompression, rectification etc.
The detection electric signal of the input, two controlled switch and output end managing to detect AC-DC converter, can effectively be reduced
The sensor on the AC-DC converter is arranged on, the circuit complexity of AC-DC converter is effectively simplified；Together
When, utilize detected electric signal to pass through mathematical computations and control circuit to change the dutycycle of pulse signal, can be real-time
Ground, exactly control AC-DC converter in two controlled switch break-make, so as to the AC-DC converter by
During external interference, remain to export stabilized power source.So, the present invention effectively overcomes various shortcoming of the prior art and has height
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 (8)
1. a kind of Bridgeless power factor controller of AC-DC converter, the AC-DC converter at least includes：With it is defeated
The for entering the inductance of the live wire connection at end, the first controlled switch with the inductance connection, being connected with the zero line of the input
Two controlled switch, and the output end being connected with first controlled switch and the second controlled switch, wherein, described first is controlled
Switch and second controlled switch are controlled by same pulse signal, and, first controlled switch and the second controlled switch connect
It is connected to same one end of output；Characterized in that, Bridgeless power factor controller at least includes：
Detection unit, for by from the input ac signal carry out step-down rectifier processing, with obtain with it is described defeated
Enter the first detection electric signal of the ac signal matching at end；Detect the current signal of first controlled switch and second controlled
The current signal sum of switch, and it regard described and value as the second detection electric signal；And the detection output end over the ground the
Three detection electric signals；
Control unit, for based on default circuit formula, and using described first detect electric signal, the second detection electric signal,
3rd detects electric signal to determine the electric signal of the inductance；And utilize the electric signal of the inductance, the first detection telecommunications
Number, second detection electric signal and the 3rd detection electric signal come carry out loop control calculating, to obtain controlled quentity controlled variable；And based on the control
Amount processed changes the dutycycle of pulse signal；And the pulse signal is transported into first controlled switch and second controlled opened
Close, the alternately break-make of the control based on the pulse signal so as to first controlled switch and the second controlled switch.
2. the Bridgeless power factor controller of AC-DC converter according to claim 1, it is characterised in that the inspection
Surveying unit includes：
The first detection circuit being connected with the live wire and zero line, it includes：The transformer being connected with the live wire and zero line, with
The rectifier of the transformer connection, the multiple first resistors being connected with the rectifier, and first electricity with ground connection
Hinder the first electric capacity of connection.
3. the Bridgeless power factor controller of AC-DC converter according to claim 1, it is characterised in that the inspection
Surveying unit also includes：
The second detection circuit being connected with first controlled switch and second controlled switch, it includes：Correspondence connection institute
Two second resistances of the first controlled switch and the second controlled switch are stated, each anode correspondence one second resistance of connection
Diode, and the grounding resistance being connected with diode cathode each described；Wherein, the negative electrode of two diodes is connected
Connect.
4. the Bridgeless power factor controller of AC-DC converter according to claim 1, it is characterised in that the inspection
Surveying unit also includes：
The three testing circuit being connected with the output end, it includes：The 3rd resistor being connected with the output end.
5. the Bridgeless power factor controller of AC-DC converter according to claim 2, it is characterised in that the control
Unit processed includes：
The input voltage computing module being connected with the first resistor of ground connection, for based on the first detection electric signal detected
Calculate the instantaneous voltage and voltage effective value of the input.
6. the Bridgeless power factor controller of AC-DC converter according to claim 4, it is characterised in that the control
Unit processed also includes：
The output voltage computing module being connected with the 3rd resistor, for calculating institute based on the 3rd detection electric signal detected
State the instantaneous voltage of output end.
7. the Bridgeless power factor controller of AC-DC converter according to claim 6, it is characterised in that the control
Unit processed also includes：
Inductive current computing module, electric signal is detected and described for the instantaneous voltage using the input, described second
Circuit formula that the instantaneous voltage of output end is constituted calculates the current instantaneous value of the inductance.
8. the Bridgeless power factor controller of AC-DC converter according to claim 7, it is characterised in that the control
Unit processed also includes：Corrective control module, for the voltage wink using the current instantaneous value comprising the inductance, the output end
The circuit formula of the voltage effective value of duration, the instantaneous voltage of the input and input comes to the AC/DC transfer
Device is controlled calculating, and the result based on calculating changes the dutycycle of pulse signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210464968.0A CN103825445B (en) | 2012-11-16 | 2012-11-16 | The Bridgeless power factor controller of AC-DC converter |
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| CN201210464968.0A CN103825445B (en) | 2012-11-16 | 2012-11-16 | The Bridgeless power factor controller of AC-DC converter |
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| CN103825445B true CN103825445B (en) | 2017-07-25 |
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| CN104393750A (en) * | 2014-11-25 | 2015-03-04 | 广东易事特电源股份有限公司 | Bridgeless PFC (power factor correction) circuit |
| CN107222006A (en) * | 2017-08-03 | 2017-09-29 | 北京理工大学 | A kind of wireless charging system output energy steering circuit and control method |
| DE212020000155U1 (en) * | 2020-07-16 | 2020-09-29 | Shenzhen Sunny Xiao Engineering Consulting Co., Ltd. | A power supply system and solar simulator |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1864319A (en) * | 2003-10-01 | 2006-11-15 | 国际整流器公司 | Bridgeless boost converter with pfc circuit |
| CN101151791A (en) * | 2005-03-31 | 2008-03-26 | 国际整流器公司 | Bridgeless boost converter with PFC circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7250742B2 (en) * | 2004-11-08 | 2007-07-31 | International Rectifier Corporation | Digital control of bridgeless power factor correction circuit |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1864319A (en) * | 2003-10-01 | 2006-11-15 | 国际整流器公司 | Bridgeless boost converter with pfc circuit |
| CN101151791A (en) * | 2005-03-31 | 2008-03-26 | 国际整流器公司 | Bridgeless boost converter with PFC circuit |
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Effective date of registration: 20191101 Address after: 200433 Shanghai City, Yangpu District National Road No. 323 room 1102-125 Patentee after: Shanghai Auto Control System Co., Ltd. Address before: 200433 No. 1803, 1805, 1806, 335 and 1807, building 2, National Road, Yangpu District, Shanghai Patentee before: Shanghai Ruking Electronic Science & Technology Co., Ltd. |