CN105846667A - Power factor correction PFC circuit and current sampling device thereof - Google Patents
Power factor correction PFC circuit and current sampling device thereof Download PDFInfo
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- CN105846667A CN105846667A CN201610291003.4A CN201610291003A CN105846667A CN 105846667 A CN105846667 A CN 105846667A CN 201610291003 A CN201610291003 A CN 201610291003A CN 105846667 A CN105846667 A CN 105846667A
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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
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4233—Arrangements for improving power factor of AC input using a bridge converter comprising active switches
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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 invention discloses a power factor correction PFC circuit and a current sampling device thereof. The PFC circuit comprises first to fourth MOS transistors and a driving control device. The current sampling device comprises a current transformer which is provided with a first primary winding, a second primary winding and a secondary winding. The first primary winding is connected between the first MOS transistor and the third MOS transistor. The second primary winding is connected between the second MOS transistor and the fourth MOS transistor. The secondary winding is used for inducing current of the first primary winding or the second primary winding so as to generate induced current. The current sampling device also comprises a detection module of which the first input end and the second input end are respectively connected with the two ends of the secondary winding and the output end is connected with the driving control device. The detection module is used for generating a current detection signal according to induced current so that the driving control device is enabled to control the PFC circuit according to the current detection signal and the positive and negative half cycle of current sampling can be realized by only one current transformer, and thus the circuit structure is simplified, circuit cost is reduced and stability of the system is enhanced.
Description
Technical field
The present invention relates to power factor correction technology field, particularly to current sampling device and a kind of tool of a kind of pfc circuit
There is the PFC pfc circuit of this device.
Background technology
Along with developing rapidly of communication power supply, Energy Star 80plus to the requirement of efficiency from platinum to titanium, in order to reach titanium
The peak efficiencies requirement of gold 96%, totem PFC (Power Factor Correction, the power factor in correlation technique
Correction) input of circuit can cancel rectifier bridge, and use MOSFET to replace commutation diode so that pfc circuit
Efficiency reaches optimum.The pfc circuit effective input current signal that needs to sample so that input current follows the tracks of input voltage, but,
Owing to input eliminates rectifier bridge, so being difficult to gather high frequency electric, in the related, generally use following two side
Formula sampled current signals:
The first, as it is shown in figure 1, by two single current transformer sampled current signals, but, what it existed lacks
Point is to sample the idle current signal flowing through synchronous rectifier, if idle current signal does not do meeting to control circuit
The stability of validity and converter produces impact, and uses two current transformers relatively costly, and interference free performance is poor,
Circuit-board laying-out difficulty is big, and two current transformers are also easy to saturated because of magnetic biasing；
It two is, as in figure 2 it is shown, by Hall element H ＇ sampled current signals, but, it has the drawback that, suddenly
The narrower bandwidth of you element H ＇ so that the setting of switching frequency is restricted, and Hall element H ＇ price is higher and needs
Independent positive-negative power is powered, and adds cost and complexity in circuits.
Summary of the invention
It is contemplated that one of technical problem solved the most to a certain extent in correlation technique.To this end, the one of the present invention
Purpose is to propose the current sampling device of a kind of pfc circuit, and this installation cost is low and avoids sampling and affects circuit work
Idle current signal.
Further object is that a kind of PFC pfc circuit of proposition.
For reaching above-mentioned purpose, one aspect of the present invention embodiment proposes the current sampling device of a kind of pfc circuit, described PFC
Circuit includes the first metal-oxide-semiconductor to the 4th metal-oxide-semiconductor and drives dynamic control device, the drain electrode of described first metal-oxide-semiconductor and described 3rd MOS
The source electrode of pipe is connected, and the drain electrode of described 3rd metal-oxide-semiconductor is connected with the drain electrode of described 4th metal-oxide-semiconductor, described 4th metal-oxide-semiconductor
Source electrode is connected with the drain electrode of described second metal-oxide-semiconductor, and the source electrode of described second metal-oxide-semiconductor is connected with the source electrode of described first metal-oxide-semiconductor
Rear ground connection, described in drive the grid of dynamic control device and described first metal-oxide-semiconductor to the 4th metal-oxide-semiconductor and be respectively connected with, described drive control
Device processed is switched on or off to the 4th metal-oxide-semiconductor for controlling described first metal-oxide-semiconductor respectively, and described current sampling device includes:
Current transformer, described current transformer has the first primary side winding, the second primary side winding and a vice-side winding, described first former
Limit winding is connected between described first metal-oxide-semiconductor and described 3rd metal-oxide-semiconductor, and described second primary side winding is connected to described second
Between metal-oxide-semiconductor and described 4th metal-oxide-semiconductor, described vice-side winding is used for sensing described first primary side winding or described second former limit
The electric current of winding is to generate induced-current；Detection module, the first input end of described detection module and the one of described vice-side winding
End is connected, and the second input of described detection module is connected with the other end of described vice-side winding, the output of described detection module
End is connected with the described dynamic control device that drives, and described detection module is used for generating current detection signal according to described induced-current, with
Drive dynamic control device described in making according to described current detection signal, described pfc circuit to be controlled.
The current sampling device of the pfc circuit proposed according to embodiments of the present invention, by the first primary side winding of current transformer even
Be connected between the first metal-oxide-semiconductor and the 3rd metal-oxide-semiconductor, and the second primary side winding of current transformer is connected to the second metal-oxide-semiconductor with
Between 4th metal-oxide-semiconductor, the vice-side winding of current transformer is according to the first primary side winding or the second former limit flowing through current transformer
The electric current of winding generates induced-current, and detection module generates current detection signal according to induced-current, so that driving dynamic control device
According to current detection signal, pfc circuit is controlled, thus only needs a current transformer can realize positive-negative half-cycle
Current sample, simplifies circuit structure, reduces circuit cost, and avoids sampling the idle current affecting circuit work
Signal, improves the stability of system.
According to one embodiment of present invention, one end of described first primary side winding is connected with the source electrode of described 3rd metal-oxide-semiconductor,
The other end of described first primary side winding is connected with the described drain electrode of the first metal-oxide-semiconductor and the live wire of AC power, described second former
One end of limit winding is connected with the drain electrode of described second metal-oxide-semiconductor, the other end of described second primary side winding and described 4th MOS
The source electrode of pipe is connected with the zero line of AC power.
According to one embodiment of present invention, the other end of described first primary side winding and the other end of described second primary side winding
For Same Name of Ends.
According to one embodiment of present invention, described detection module includes: the first diode, the anode of described first diode
It is connected with one end of described vice-side winding；First resistance, the negative electrode phase of one end of described first resistance and described first diode
Even, the other end of described first resistance is connected with the other end of described vice-side winding, the other end ground connection of described vice-side winding,
Having first node between described first resistance and described first diode, described first node drives dynamic control device phase with described
Even.
According to one embodiment of present invention, described detection module also includes: the second diode, the moon of described second diode
Pole is connected with one end of described vice-side winding；Voltage-stabiliser tube, the anode of described voltage-stabiliser tube is connected with the anode of described second diode,
The negative electrode of described voltage-stabiliser tube is connected with the other end of described vice-side winding.
According to one embodiment of present invention, when described first metal-oxide-semiconductor and described second metal-oxide-semiconductor are opened, described secondary around
Group is by sensing the electric current of described second primary side winding to generate induced-current；As described 3rd metal-oxide-semiconductor and described 4th MOS
When pipe is opened, described vice-side winding is by sensing the electric current of described first primary side winding to generate induced-current.
According to one embodiment of present invention, when described 3rd metal-oxide-semiconductor and described second metal-oxide-semiconductor are opened, described first former
The magnetic flux that limit winding and described second primary side winding produce is cancelled out each other；When described first metal-oxide-semiconductor and described 4th metal-oxide-semiconductor are opened
Time logical, described first primary side winding and described second primary side winding no current flow through.
For reaching above-mentioned purpose, a kind of PFC pfc circuit that another aspect of the present invention embodiment proposes, including institute
The current sampling device of the pfc circuit stated.
The PFC pfc circuit proposed according to embodiments of the present invention a, it is only necessary to current transformer just can realize
The current sample of negative half period, simplifies circuit structure, reduces circuit cost, and avoids sampling and affect circuit work
Idle current signal, improves the stability of system.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of a kind of PFC pfc circuit in correlation technique；
Fig. 2 is the circuit theory diagrams of the another kind of PFC pfc circuit in correlation technique；
Fig. 3 is the block diagram of the current sampling device of pfc circuit according to embodiments of the present invention；
Fig. 4 is the control logical schematic of PFC pfc circuit according to embodiments of the present invention；
Fig. 5 is the circuit theory diagrams of the current sampling device of pfc circuit according to an embodiment of the invention, wherein, PFC
Circuit is in positive half period, and the first metal-oxide-semiconductor MOSFET1 is open-minded；
Fig. 6 is the circuit theory diagrams of the current sampling device of pfc circuit according to an embodiment of the invention, wherein, PFC
Circuit is in positive half period, and the 3rd metal-oxide-semiconductor MOSFET3 is open-minded；
Fig. 7 is the circuit theory diagrams of the current sampling device of pfc circuit according to an embodiment of the invention, wherein, PFC
Circuit is in negative half-cycle, and the 3rd metal-oxide-semiconductor MOSFET3 is open-minded；
Fig. 8 is the circuit theory diagrams of the current sampling device of pfc circuit according to an embodiment of the invention, wherein, PFC
Circuit is in negative half-cycle, and the first metal-oxide-semiconductor MOSFET1 is open-minded；
Fig. 9 is the current direction schematic diagram of current transformer in Fig. 5；
Figure 10 is the current direction schematic diagram of current transformer in Fig. 6；
Figure 11 is the current direction schematic diagram of current transformer in Fig. 7；
Figure 12 is the current direction schematic diagram of current transformer in Fig. 8；
Figure 13 is the sample waveform schematic diagram of the current sampling device of the pfc circuit according to one concrete example of the present invention；And
Figure 14 is the expansion of the sample waveform schematic diagram of the current sampling device of the pfc circuit according to one concrete example of the present invention
Figure.
Reference:
First metal-oxide-semiconductor MOSFET1, the second metal-oxide-semiconductor MOSFET2, the 3rd metal-oxide-semiconductor MOSFET3 and the 4th metal-oxide-semiconductor MOSFET4；
Current transformer 1, detection module 2 and drive dynamic control device 3；
First primary side winding the 10, second primary side winding 20 and vice-side winding 30；
First diode D1, the first resistance R1, the second diode D2 and voltage-stabiliser tube ZD1；
Inductance coil L1, the first electric capacity C1 and the second electric capacity C2.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, the most identical
Or similar label represents same or similar element or has the element of same or like function.Retouch below with reference to accompanying drawing
The embodiment stated is exemplary, it is intended to is used for explaining the present invention, and is not considered as limiting the invention.
PFC pfc circuit and current sampling device thereof that the embodiment of the present invention proposes are described below in conjunction with the accompanying drawings.
Fig. 3 is the block diagram of the current sampling device of PFC pfc circuit according to embodiments of the present invention.As
Shown in Fig. 3, pfc circuit includes the first metal-oxide-semiconductor MOSFET1 to the 4th metal-oxide-semiconductor MOSFET4 and drives dynamic control device 3.
Wherein, the drain electrode of the first metal-oxide-semiconductor MOSFET1 is connected with the source electrode of the 3rd metal-oxide-semiconductor MOSFET3, the 3rd metal-oxide-semiconductor
The drain electrode of MOSFET3 is connected with the drain electrode of the 4th metal-oxide-semiconductor MOSFET4, the source electrode of the 4th metal-oxide-semiconductor MOSFET4 and the 2nd MOS
The drain electrode of pipe MOSFET2 is connected, after the source electrode of the second metal-oxide-semiconductor MOSFET2 and the source electrode of the first metal-oxide-semiconductor MOSFET1 are connected
Ground connection, the grid driving dynamic control device 3 and the first metal-oxide-semiconductor MOSFET1 to the 4th metal-oxide-semiconductor MOSFET4 is respectively connected with, and drives
Dynamic control device 3 is switched on or off for controlling the first metal-oxide-semiconductor MOSFET1 to the 4th metal-oxide-semiconductor MOSFET4 respectively.
Specifically, PFC pfc circuit includes a high frequency brachium pontis and a low frequency brachium pontis, such as Fig. 3 and Fig. 5-8
Shown in, high frequency brachium pontis can include the first metal-oxide-semiconductor MOSFET1 and the 3rd metal-oxide-semiconductor MOSFET3, and low frequency brachium pontis can include second
Metal-oxide-semiconductor MOSFET2 and the 4th metal-oxide-semiconductor MOSFET4, wherein, the operating frequency of low frequency brachium pontis is identical with the frequency of input current,
The operating frequency of high frequency brachium pontis can be set according to user's request, and driving dynamic control device 3 can be according to controlling logic shown in Fig. 4
First metal-oxide-semiconductor MOSFET1 to the 4th metal-oxide-semiconductor MOSFET4 is controlled by schematic diagram respectively.
As shown in Figure 4, the first metal-oxide-semiconductor MOSFET1 and the 3rd metal-oxide-semiconductor MOSFET3 main switch each other and synchronous rectifier,
I.e. say, when input current Iac is in positive half period, the first metal-oxide-semiconductor MOSFET1 as main switch, the 3rd metal-oxide-semiconductor
MOSFET3 is as synchronous rectifier；When input current Iac is in negative half-cycle, the 3rd metal-oxide-semiconductor MOSFET3 is as master
Switching tube, the first metal-oxide-semiconductor MOSFET1 is as synchronous rectifier.Wherein, the first metal-oxide-semiconductor MOSFET1 or the 3rd metal-oxide-semiconductor
The current signal sampled when MOSFET3 is as main switch is useful signal, and as the electric current of sampling during synchronous rectifier
Signal is invalid signals.
The current sampling device of the embodiment of the present invention can use a current transformer with two primary side winding, samples
First metal-oxide-semiconductor MOSFET1 or the 3rd metal-oxide-semiconductor MOSFET3 is as effective current signal during main switch.
As shown in Fig. 3 and Fig. 5-8, the current sampling device of the embodiment of the present invention includes: current transformer 1 and detection module 2.
Wherein, current transformer 1 has the first primary side winding the 10, second primary side winding 20 and vice-side winding 30, and first is former
Limit winding 10 is connected between the first metal-oxide-semiconductor MOSFET1 and the 3rd metal-oxide-semiconductor MOSFET3, and the second primary side winding 20 connects
Between the second metal-oxide-semiconductor MOSFET2 and the 4th metal-oxide-semiconductor MOSFET4, vice-side winding 30 is for sensing the first primary side winding
10 or second the electric current of primary side winding 20 to generate induced-current；The first input end of detection module 2 and vice-side winding 30
One end be connected, the second input of detection module 2 is connected with the other end of vice-side winding 30, the output of detection module 2 and
Driving dynamic control device 3 to be connected, detection module 2, for generating current detection signal according to induced-current, controls dress so that driving
Put 3 according to current detection signal, pfc circuit to be controlled.
Specifically, when pfc circuit works, the first metal-oxide-semiconductor MOSFET1 and the 3rd metal-oxide-semiconductor MOSFET3 is main each other to be opened
Close pipe and synchronous rectifier, and the first metal-oxide-semiconductor MOSFET1 to the 4th metal-oxide-semiconductor MOSFET4 is driving dynamic control device 3
Open under control or turn off, to form different conducting loops.When input current Iac flows through the first of current transformer 1
When primary side winding 10 or the second primary side winding 20, vice-side winding 30 senses the first primary side winding 10 or the second primary side winding 20
Electric current to generate induced-current.Detection module 2 generates current detection signal according to induced-current, drives dynamic control device 3
According to current detection signal, pfc circuit is controlled, with the Energy distribution in the adjustment cycle so that input current follows the tracks of input
Voltage.
Thus, effective current detection signal just can be sampled by a current transformer with two primary side winding,
Simplify circuit structure, reduce circuit cost.
According to one embodiment of present invention, as shown in Fig. 3 and Fig. 5-8, one end a1 and the 3rd of the first primary side winding 10
The source electrode of metal-oxide-semiconductor MOSFET3 is connected, the other end b1 of the first primary side winding 10 and the drain electrode of the first metal-oxide-semiconductor MOSFET1
It is connected with the live wire ACL of AC power, one end a2 of the second primary side winding 20 and the drain electrode phase of the second metal-oxide-semiconductor MOSFET2
Even, the other end b2 of the second primary side winding MOSFET2 and the source electrode of the 4th metal-oxide-semiconductor MOSFET4 and the zero line of AC power
ACN is connected.
According to one embodiment of present invention, as it is shown on figure 3, the other end b1 of the first primary side winding 10 and the second former limit around
The other end b2 of group 20 is Same Name of Ends.Further, the other end b1 of the first primary side winding 10 and the other end of vice-side winding 30
Also it is Same Name of Ends.
Specifically, the first primary side winding 10 and the second primary side winding 20 flow through the concrete condition of input current can be such as Fig. 5-12
Shown in, wherein, the current direction in arrow indication indication circuit.
According to one embodiment of present invention, as it is shown in figure 5, work as the first metal-oxide-semiconductor MOSFET1 and the second metal-oxide-semiconductor MOSFET2
When opening, vice-side winding 30 is by sensing the electric current of the second primary side winding 20 to generate induced-current.
Specifically, as shown in Figure 4, if input current Iac is in positive half period, then the first metal-oxide-semiconductor MOSFET1 makees
For main switch, the 3rd metal-oxide-semiconductor MOSFET3 is as synchronous rectifier, and drives dynamic control device 3 and control the second metal-oxide-semiconductor
MOSFET2 is open-minded, and controls the 4th metal-oxide-semiconductor MOSFET4 shutoff.The first metal-oxide-semiconductor MOSFET1 is controlled when driving dynamic control device 3
When opening, as shown in figs. 5 and 9, electric current flows successively through the first metal-oxide-semiconductor MOSFET1, the second metal-oxide-semiconductor MOSFET2 and
Two primary side winding 20, vice-side winding 30 can sense the electric current of the second primary side winding 20 to generate induced-current, detection module 2
Current detection signal can be generated according to induced-current.Thus, when the first metal-oxide-semiconductor MOSFET1 is as main switch, detection
Module 2 can detect the electric current flowing through the first metal-oxide-semiconductor MOSFET1, i.e. effective current detection signal.
According to one embodiment of present invention, as shown in Figure 6, as the 3rd metal-oxide-semiconductor MOSFET3 and the second metal-oxide-semiconductor MOSFET2
When opening, the magnetic flux that the first primary side winding 10 and the second primary side winding 20 produce is cancelled out each other.
Specifically, as shown in Figure 4, if input current Iac is in positive half period, then the first metal-oxide-semiconductor MOSFET1 makees
For main switch, the 3rd metal-oxide-semiconductor MOSFET3 is as synchronous rectifier, and drives dynamic control device 3 and control the second metal-oxide-semiconductor
MOSFET2 is open-minded, and controls the 4th metal-oxide-semiconductor MOSFET4 shutoff.The 3rd metal-oxide-semiconductor MOSFET3 is controlled when driving dynamic control device 3
When opening, as illustrated in figs. 6 and 10, electric current flow successively through the first primary side winding the 10, the 3rd metal-oxide-semiconductor MOSFET3, second
Metal-oxide-semiconductor MOSFET2 and the second primary side winding 20, now due to the other end b1 of the first primary side winding 10 and the second former limit around
The other end b2 of group 20 is Same Name of Ends, and the magnetic flux that the first primary side winding 10 and the second primary side winding 20 produce is cancelled out each other,
Detection module 2 not sample rate current detection signal.Thus, when the first metal-oxide-semiconductor MOSFET1 is as main switch, detect mould
Block 2 will not detect the electric current flowing through synchronous rectifier that is the 3rd metal-oxide-semiconductor MOSFET3, invalid electric current i.e. will not be detected
Detection signal.
As it is shown in fig. 7, when the 3rd metal-oxide-semiconductor MOSFET3 and the 4th metal-oxide-semiconductor MOSFET4 opens, vice-side winding 30 senses
The electric current of the first primary side winding 10 is to generate induced-current.
Specifically, as shown in Figure 4, if input current Iac is in negative half-cycle, then the 3rd metal-oxide-semiconductor MOSFET3 makees
For main switch, the first metal-oxide-semiconductor MOSFET1 is as synchronous rectifier, and drives dynamic control device 3 and control the 4th metal-oxide-semiconductor
MOSFET4 is open-minded, and controls the second metal-oxide-semiconductor MOSFET2 shutoff.The 3rd metal-oxide-semiconductor MOSFET3 is controlled when driving dynamic control device 3
When opening, as shown in figs. 7 and 11, electric current flows successively through the 4th metal-oxide-semiconductor MOSFET4, the 3rd metal-oxide-semiconductor MOSFET3 and
One primary side winding 10, vice-side winding 30 can sense the electric current of the first primary side winding 10 to generate induced-current, detection module 2
Current detection signal can be generated according to induced-current.Thus, when the 3rd metal-oxide-semiconductor MOSFET3 is as main switch, detection
Module 2 can detect the electric current flowing through the 3rd metal-oxide-semiconductor MOSFET3 as main switch, i.e. effective current detection signal.
As shown in Figure 8, when the first metal-oxide-semiconductor MOSFET1 and the 4th metal-oxide-semiconductor MOSFET4 opens, the first primary side winding 10
Flow through with the second primary side winding 20 no current.
Specifically, as shown in Figure 4, if input current Iac is in negative half-cycle, then the 3rd metal-oxide-semiconductor MOSFET3 makees
For main switch, the first metal-oxide-semiconductor MOSFET1 is as synchronous rectifier, and drives dynamic control device 3 and control the 4th metal-oxide-semiconductor
MOSFET4 is open-minded, and controls the second metal-oxide-semiconductor MOSFET2 shutoff.The first metal-oxide-semiconductor MOSFET1 is controlled when driving dynamic control device 3
When opening, as illustrated in FIG 8 and FIG 12, electric current flows successively through the 4th metal-oxide-semiconductor MOSFET4 and the first metal-oxide-semiconductor MOSFET1, the
One primary side winding 10 and the second primary side winding 20 no current flow through, detection module 2 not sample rate current detection signal.Thus,
When the 3rd metal-oxide-semiconductor MOSFET1 is as main switch, detection module 2 will not detect and flow through synchronous rectifier that is the oneth MOS
The electric current of pipe MOSFET1, i.e. will not detect invalid current detection signal.
As it has been described above, in the positive half period of pfc circuit, in the energy storage stage, as shown in figs. 5 and 9, drive dynamic control device 3
Controlling the first metal-oxide-semiconductor MOSFET1 and the second metal-oxide-semiconductor MOSFET2 open-minded, vice-side winding 30 flows through the second former limit by sensing
The electric current of winding 20 generates induced-current, and detection module 2 obtains flowing through main switch that is the oneth MOS according to induced-current sampling
The electric current of pipe MOSFET1, and at freewheeling period, as illustrated in figs. 6 and 10, drive dynamic control device 3 and control the 3rd metal-oxide-semiconductor
MOSFET3 and the second metal-oxide-semiconductor MOSFET2 is open-minded, and the magnetic flux of two primary side winding is cancelled out each other, and detection module 2 will not be adopted
Sample flows through the electric current of synchronous rectifier that is the 3rd metal-oxide-semiconductor MOSFET3；In the negative half-cycle of pfc circuit, in the energy storage stage,
As shown in figs. 7 and 11, driving dynamic control device 3, to control the 3rd metal-oxide-semiconductor MOSFET3 and the 4th metal-oxide-semiconductor MOSFET4 open-minded,
The electric current that vice-side winding 30 flows through the first primary side winding 10 by sensing generates induced-current, and detection module 2 is according to induced electricity
Stream sampling obtains flowing through the electric current of main switch that is the 3rd metal-oxide-semiconductor MOSFET3, and at freewheeling period, as illustrated in FIG 8 and FIG 12,
Driving dynamic control device 3, to control the first metal-oxide-semiconductor MOSFET1 and the 4th metal-oxide-semiconductor MOSFET4 open-minded, does not has electric current to flow through two
Primary side winding, detection module 2 will not be sampled and be flow through the electric current of synchronous rectifier that is first metal-oxide-semiconductor MOSFET1.
So, by having the current transformer 1 of two primary side winding, in conjunction with the course of work without bridge totem pfc circuit,
Can sample the current waveform of two main switches cleverly, a current transformer can realize the current sample of positive-negative half-cycle,
Simplify circuit structure, reduce cost, and the idle current signal that may affect circuit work will not be sampled, improve
The reliability of device.
According to one embodiment of present invention, as shown in Fig. 3 and Fig. 5-8, detection module 2 includes: the first diode D1 and
First resistance R1.
Wherein, the anode of the first diode D1 is connected with one end of vice-side winding 30；One end and the one or two of first resistance R1
The negative electrode of pole pipe D1 is connected, and the other end of the first resistance R1 is connected with the other end of vice-side winding 30, vice-side winding 30
Other end ground connection, has a first node between the first resistance R1 and the first diode D1, first node with drive dynamic control device
3 are connected.
As shown in Fig. 3 and Fig. 5-8, detection module 2 also includes: the second diode D2 and voltage-stabiliser tube ZD1.Wherein, second
The negative electrode of diode D2 is connected with one end of vice-side winding 30；The anode of voltage-stabiliser tube ZD1 and the anode phase of the second diode D2
Even, the negative electrode of voltage-stabiliser tube ZD1 is connected with the other end of vice-side winding 30.
Specifically, first node is connected with the input CS driving dynamic control device 3, drives dynamic control device 3 according to detection mould
The current detection signal of block 2 outputs control signals to the first signal receiving end V1L, secondary signal receiving terminal V2L, the 3rd signal
Receiving terminal V1H and the 4th signal receiving end V2L, controls the first metal-oxide-semiconductor MOSFET1 to the 4th metal-oxide-semiconductor MOSFET4 with correspondence
Be switched on or off, thus pfc circuit is controlled, with the Energy distribution in the adjustment cycle so that input current is followed the tracks of
Input voltage.
Further, according to the embodiment of Fig. 3 and Fig. 5-8, the other end b1 of the first primary side winding 10 is also by inductor wire
Circle L1 is connected with the live wire ACL of AC power.Parallel connection is had it addition, be connected between the drain electrode of the 4th metal-oxide-semiconductor MOSFET4 and ground
The the first electric capacity C1 connected and the second electric capacity C2.
A concrete example according to the present invention, is applied to above-mentioned current sampling device in totem pfc circuit, it is assumed that PFC
The input voltage of circuit is exchange 180V, and the output voltage of pfc circuit is 400V, and the output electric current of pfc circuit is 3A, on
State current sampling device available input current Iac, the output voltage Vo as shown in fig. 13 that of embodiment and drive signal Va
Waveform, wherein, input current Iac waveform is sinusoidal wave, it was demonstrated that the current sampling device of the embodiment of the present invention should
The property used.
It should be appreciated that owing to the frequency of electric current Iac is 50Hz, driving signal Va is high-frequency signal, to shown in Figure 13
Waveform diagram be amplified launching, available waveform as shown in figure 14.Thus, propose according to embodiments of the present invention
The current sampling device of pfc circuit, is connected to the first metal-oxide-semiconductor and the 3rd metal-oxide-semiconductor by the first primary side winding of current transformer
Between, and the second primary side winding of current transformer is connected between the second metal-oxide-semiconductor and the 4th metal-oxide-semiconductor, current transformer
Vice-side winding generate induced-current, inspection according to the electric current flowing through the first primary side winding of current transformer or the second primary side winding
Survey module and generate current detection signal according to induced-current, so that driving dynamic control device according to current detection signal to pfc circuit
It is controlled, thus only needs a current transformer can realize the current sample of positive-negative half-cycle, simplify circuit structure,
Reduce circuit cost, and avoid sampling the idle current signal affecting circuit work, improve the stability of system.
Finally, the invention allows for a kind of PFC pfc circuit, including the current sampling device of above-described embodiment.
Wherein, current sampling device includes having the first primary side winding, the second primary side winding and the current transformer of vice-side winding and inspection
Survey module.
It should be appreciated that the concrete structure of the current sampling device of pfc circuit, operation principle are as previously described in the embodiment,
The most for purposes of brevity, repeat the most one by one.
To sum up, the PFC pfc circuit proposed according to embodiments of the present invention a, it is only necessary to current transformer
Realize the current sample of positive-negative half-cycle, simplify circuit structure, reduce circuit cost, and avoid sampling and affect circuit
The idle current signal of work, improves the stability of system.
In describing the invention, it is to be understood that term " " center ", " longitudinally ", " laterally ", " length ", " width ",
" thickness ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ",
" outward ", " clockwise ", " counterclockwise ", " axially ", " radially ", " circumferential " etc. instruction orientation or position relationship be based on
Orientation shown in the drawings or position relationship, be for only for ease of the description present invention and simplify description rather than instruction or hint institute
The device that refers to or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to this
Bright restriction.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed
Or implicitly include at least one this feature.In describing the invention, " multiple " are meant that at least two, such as two
Individual, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, term " install ", " being connected ", " connection ", " fixing "
Should be interpreted broadly Deng term, connect for example, it may be fixing, it is also possible to be to removably connect, or integral；Can be
It is mechanically connected, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, can be two
The connection of individual element internal or the interaction relationship of two elements, unless otherwise clear and definite restriction.Common for this area
For technical staff, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can
Being that the first and second features directly contact, or the first and second features are by intermediary mediate contact.And, the
One feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or
Oblique upper, or it is merely representative of fisrt feature level height higher than second feature.Fisrt feature second feature " under ",
" lower section " and " below " can be fisrt feature immediately below second feature or obliquely downward, or it is special to be merely representative of first
Levy level height less than second feature.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
Example " or the description of " some examples " etc. means to combine this embodiment or example describes specific features, structure, material or
Feature is contained at least one embodiment or the example of the present invention.In this manual, the schematic representation to above-mentioned term
Necessarily it is directed to identical embodiment or example.And, the specific features of description, structure, material or feature are permissible
One or more embodiment in office or example combine in an appropriate manner.Additionally, in the case of the most conflicting, ability
The feature of the different embodiments described in this specification or example and different embodiment or example can be entered by the technical staff in territory
Row combines and combination.
Although above it has been shown and described that embodiments of the invention, it is to be understood that above-described embodiment is exemplary,
Being not considered as limiting the invention, those of ordinary skill in the art within the scope of the invention can be to above-described embodiment
It is changed, revises, replaces and modification.
Claims (8)
1. the current sampling device of a PFC pfc circuit, it is characterised in that described pfc circuit includes first
Metal-oxide-semiconductor is to the 4th metal-oxide-semiconductor and drives dynamic control device, the drain electrode of described first metal-oxide-semiconductor and the source electrode phase of described 3rd metal-oxide-semiconductor
Even, the drain electrode of described 3rd metal-oxide-semiconductor is connected with the drain electrode of described 4th metal-oxide-semiconductor, and the source electrode of described 4th metal-oxide-semiconductor is with described
The drain electrode of the second metal-oxide-semiconductor is connected, and the source electrode of described second metal-oxide-semiconductor is connected with the source electrode of described first metal-oxide-semiconductor afterwards ground connection, institute
State and drive the grid of dynamic control device and described first metal-oxide-semiconductor to the 4th metal-oxide-semiconductor and be respectively connected with, described in drive dynamic control device for
Controlling described first metal-oxide-semiconductor respectively to be switched on or off to the 4th metal-oxide-semiconductor, described current sampling device includes:
Current transformer, described current transformer has the first primary side winding, the second primary side winding and a vice-side winding, and described
One primary side winding is connected between described first metal-oxide-semiconductor and described 3rd metal-oxide-semiconductor, and described second primary side winding is connected to described
Between second metal-oxide-semiconductor and described 4th metal-oxide-semiconductor, described vice-side winding is used for sensing described first primary side winding or described second
The electric current of primary side winding is to generate induced-current；
Detection module, the first input end of described detection module is connected with one end of described vice-side winding, described detection module
Second input is connected with the other end of described vice-side winding, and the output of described detection module drives dynamic control device phase with described
Even, described detection module for generating current detection signal according to described induced-current so that described in drive dynamic control device according to
Described pfc circuit is controlled by described current detection signal.
The current sampling device of pfc circuit the most according to claim 1, it is characterised in that described first primary side winding
One end be connected with the source electrode of described 3rd metal-oxide-semiconductor, the leakage of the other end of described first primary side winding and described first metal-oxide-semiconductor
Pole is connected with the live wire of AC power, and one end of described second primary side winding is connected with the drain electrode of described second metal-oxide-semiconductor, described
The other end of the second primary side winding is connected with the described source electrode of the 4th metal-oxide-semiconductor and the zero line of AC power.
The current sampling device of pfc circuit the most according to claim 2, it is characterised in that described first primary side winding
The other end of the other end and described second primary side winding be Same Name of Ends.
The current sampling device of pfc circuit the most according to claim 1, it is characterised in that described detection module includes:
First diode, the anode of described first diode is connected with one end of described vice-side winding；
First resistance, one end of described first resistance is connected with the negative electrode of described first diode, another of described first resistance
End is connected with the other end of described vice-side winding, the other end ground connection of described vice-side winding, described first resistance and described first
Having first node between diode, described first node is connected with the described dynamic control device that drives.
The current sampling device of pfc circuit the most according to claim 4, it is characterised in that described detection module also wraps
Include:
Second diode, the negative electrode of described second diode is connected with one end of described vice-side winding；And
Voltage-stabiliser tube, the anode of described voltage-stabiliser tube is connected with the anode of described second diode, and the negative electrode of described voltage-stabiliser tube is with described
The other end of vice-side winding is connected.
The current sampling device of pfc circuit the most according to claim 1, it is characterised in that
When described first metal-oxide-semiconductor and described second metal-oxide-semiconductor are opened, described vice-side winding by sense described second former limit around
The electric current of group is to generate induced-current；
When described 3rd metal-oxide-semiconductor and described 4th metal-oxide-semiconductor are opened, described vice-side winding by sense described first former limit around
The electric current of group is to generate induced-current.
The current sampling device of pfc circuit the most according to claim 6, it is characterised in that
When described 3rd metal-oxide-semiconductor and described second metal-oxide-semiconductor are opened, described first primary side winding and described second primary side winding
The magnetic flux produced is cancelled out each other；
When described first metal-oxide-semiconductor and described 4th metal-oxide-semiconductor are opened, described first primary side winding and described second primary side winding
No current flows through.
8. a PFC pfc circuit, it is characterised in that include according to according to any one of claim 1-7
The current sampling device of PFC pfc circuit.
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| CN201610291003.4A CN105846667B (en) | 2016-05-04 | 2016-05-04 | PFC pfc circuit and its current sampling device |
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| CN201610291003.4A CN105846667B (en) | 2016-05-04 | 2016-05-04 | PFC pfc circuit and its current sampling device |
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| CN108631580A (en) * | 2017-03-21 | 2018-10-09 | 中国长城科技集团股份有限公司 | A kind of current sampling circuit and without bridge commutation system |
| CN109507469A (en) * | 2019-02-14 | 2019-03-22 | 上海颛芯企业管理咨询合伙企业（有限合伙） | Current sensing device |
| CN109962610A (en) * | 2017-12-22 | 2019-07-02 | 恩智浦美国有限公司 | Power factor compensation circuit |
| CN109980915A (en) * | 2019-05-17 | 2019-07-05 | 广东美的制冷设备有限公司 | Circuit of power factor correction and air conditioner |
| CN110098728A (en) * | 2019-04-24 | 2019-08-06 | 杭州中恒电气股份有限公司 | Interleaved converter current sampling circuit, sampling control method and its application |
| CN111917303A (en) * | 2020-07-14 | 2020-11-10 | 国创新能源汽车智慧能源装备创新中心(江苏)有限公司 | Control circuit of power module in power electronic transformer |
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| CN108631580A (en) * | 2017-03-21 | 2018-10-09 | 中国长城科技集团股份有限公司 | A kind of current sampling circuit and without bridge commutation system |
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| CN109980915A (en) * | 2019-05-17 | 2019-07-05 | 广东美的制冷设备有限公司 | Circuit of power factor correction and air conditioner |
| CN111917303A (en) * | 2020-07-14 | 2020-11-10 | 国创新能源汽车智慧能源装备创新中心(江苏)有限公司 | Control circuit of power module in power electronic transformer |
| CN111917303B (en) * | 2020-07-14 | 2022-08-05 | 国创移动能源创新中心(江苏)有限公司 | Control circuit of power module in power electronic transformer |
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