CN110098728A - Interleaved converter current sampling circuit, sampling control method and its application - Google Patents
Interleaved converter current sampling circuit, sampling control method and its application Download PDFInfo
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- CN110098728A CN110098728A CN201910336319.4A CN201910336319A CN110098728A CN 110098728 A CN110098728 A CN 110098728A CN 201910336319 A CN201910336319 A CN 201910336319A CN 110098728 A CN110098728 A CN 110098728A
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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
- H02M1/4216—Arrangements for improving power factor of AC input operating from a three-phase input voltage
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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
- H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
-
- 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
- H02M1/0009—Devices or circuits for detecting current in a converter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a kind of interleaved converter current sampling circuits, including current transformer, first switch, second switch, power supply and sampling processing circuit；Current transformer includes the first primary side winding, the second primary side winding and vice-side winding, the first converter is constituted after first switch and the series connection of the first primary side winding, the second converter is constituted after second switch and the series connection of the second primary side winding, and the both ends of the first converter and the second converter are connected to power supply；Sampling processing circuit is connected to the both ends of vice-side winding；First switch and the second switch is realized in a manner of phase shift 180 degree staggeredly to work.The invention also discloses a kind of interleaved converter current sampling circuit sampling control method and its applications.The present invention can solve at high cost and have the problem of delay.
Description
Technical field
The present invention relates to a kind of current sampling technique field more particularly to a kind of interleaved converter current sampling circuit, adopt
Sample control method and its application.
Background technique
General two-phase interleaved converter uses the independent current sample of two-way, and this sample mode control is simple, but for
There is such sample mode of topology of insulation request perhaps electric current two-way flow to need to use isolating device or operational amplifier,
General isolating device (such as optocoupler, Magnetic isolation chip) sampling has biggish delay, and needs to be isolated power supply, and circuit is multiple
It is miscellaneous, it is at high cost.It is as shown in the figure without bridge interleaving PFC circuit, inductance (L1 and L2) electric current, two-way switch pipe (S1 and S2) electric current
It is two-way flow, the common current sample mode of industry is using sample resistance R1 and R2, through isolation optocoupler U1 and U2, connection
To controller.This sample mode limits this since optocoupler is at high cost, have delay and needs additional isolated power supply power supply
The frequency applications and high power density application of topology.
Summary of the invention
For overcome the deficiencies in the prior art, one of the objects of the present invention is to provide a kind of interleaved converter current samples
Circuit can solve at high cost and have the problem of delay.
The second object of the present invention is to provide a kind of current sample control method of interleaved converter current sampling circuit,
It can solve at high cost and has the problem of delay.
The third object of the present invention is to provide a kind of two-way interleaved parallel PFC circuit of belt current sampling, can solve
Current sample is at high cost in two-way interleaved parallel PFC circuit and has the problem of delay.
The fourth object of the present invention is to provide a kind of Vienna pfc circuit of belt current sampling, can solve Vienna
Current sample is at high cost in pfc circuit and has the problem of delay.
An object of the present invention is implemented with the following technical solutions:
A kind of interleaved converter current sampling circuit comprising current transformer, first switch, second switch, power supply with
And sampling processing circuit；Wherein:
The current transformer include the first primary side winding, the second primary side winding and vice-side winding, the first switch and
The first converter is constituted after the series connection of first primary side winding, constitutes the second converter after second switch and the series connection of the second primary side winding,
The both ends of first converter and the second converter are connected to power supply；The sampling processing circuit be connected to the secondary side around
The both ends of group；
The first switch and the second switch is realized in a manner of phase shift 180 degree staggeredly to work；The power supply is alternating current
Source, first switch and the second switch flow through forward current or reverse current in a cycle of AC power source, first switch and
Second switch flows through the electric current of the same direction in adjacent switch periods；The switch periods are much smaller than the week of AC power source
Phase；When forward current or negative current flow through the first converter and the second converter, when electric current all the way is from the original of the first converter
When the Same Name of Ends of side winding flows to different name end, then primary side winding of the another way electric current from the second converter within the adjacent switch period
Different name end flow to Same Name of Ends.
Further, the first switch and the second switch is realized in a manner of phase shift 180 degree staggeredly works, are as follows:
The conducting and shutdown of the first switch and the second switch carry out periodically on the basis of preset switch periods
Work, when corresponding phase range is [360n+x, 360n+y] when first switch conducting, then second in adjacent switch periods
Corresponding phase range is [360n+t+x, 360n+t+y] or [360n-t+x, 360n-t+y] when switch conduction, and n is nature
Number, 0 ° 360 ° of < of < (y-x), 150 °≤t≤210 °.
Further, the first switch and the second switch is MOSFET pipe, IGBT pipe, GaN pipe, triode, brilliant lock
The two-way switch that any one of pipe and relay or their combination are constituted.
Further, the sampling processing circuit includes first diode, the second diode, third diode, the four or two
The cathode of pole pipe and first resistor, the first diode and third diode is connected to the first end of first resistor, institute
The anode for stating the second diode and the 4th diode is connected to the second end of first resistor, second diode and the four or two
The cathode of pole pipe is respectively connected to the anode of first diode and third diode；The Same Name of Ends of the vice-side winding is connected to
Between the anode of one diode and the cathode of the second diode, the different name end of the vice-side winding is being connected to third diode just
Between pole and the cathode of the 4th diode；The second end of the first resistor is grounded, to the electricity in the first resistor first end
Stream is acquired.
Further, the sampling processing circuit further includes controller, the sampled signal input connection of the controller
To the first end of the first resistor；The controller is also used to control the turn-on time of first switch and the second switch.
Further, the controller is dsp processor.
The second object of the present invention is implemented with the following technical solutions:
A kind of interleaved converter current sampling circuit using one of the object of the invention carries out the control method of current sample,
Itself the following steps are included:
Obtain the turn-on time of first switch and the second switch；
It is carried out by sampling processing circuit at the midpoint of first switch turn-on time and the midpoint of second switch turn-on time
Current acquisition respectively obtains the average current of the first converter and the average current of the second converter.
The third object of the present invention is implemented with the following technical solutions:
A kind of two-way interleaved parallel PFC circuit of belt current sampling, by the interleaved converter electric current of one of the object of the invention
Sample circuit be applied to two-way interleaved parallel PFC circuit in, the two-way interleaved parallel PFC circuit include AC power source and
The first pfc circuit and the second pfc circuit of crisscross parallel, the AC power source are connected to the first pfc circuit and the second pfc circuit
Input terminal, first pfc circuit and the second pfc circuit respectively include first switch tube and second switch, described first
Primary side winding and the second primary side winding connect to form the first converter and the second change respectively with first switch tube and second switch
Parallel operation.
Further, first pfc circuit and the second pfc circuit are boost circuit；
Or first pfc circuit further includes the first inductance, the first freewheeling diode, the second freewheeling diode；It is described
Second pfc circuit further includes the second inductance, third freewheeling diode, the 4th freewheeling diode；First freewheeling diode and
The cathode of third freewheeling diode is connected to the output end of two-way interleaved parallel PFC circuit, second freewheeling diode and
The cathode of four freewheeling diodes is respectively connected to the anode of the first freewheeling diode and third freewheeling diode, second afterflow
The plus earth of diode and the 4th freewheeling diode；The output DC side of first pfc circuit and the second pfc circuit uses
The cathode of concatenated 5th diode and the 6th diode, the 5th diode is connected to two-way interleaved parallel PFC circuit
Output end, the cathode of the 6th diode are connected to the anode of the 5th diode, the plus earth of the 6th diode；Institute
The output end for stating first switch tube is connected to the different name end of the first primary side winding, and the Same Name of Ends of first primary side winding is connected to
The first end of the first end of AC power source, the input terminal of the first switch tube and the first inductance is connected to the second afterflow two
Between the cathode of pole pipe and the anode of the first freewheeling diode, the second end phase of the second end and AC power source of first inductance
Even；The output end of the second switch is connected to the Same Name of Ends of the second primary side winding, the different name end of second primary side winding
It is connected to the first end of AC power source, the first end of the input terminal of the second switch and the second inductance is connected to the 4th
Between the cathode of freewheeling diode and the anode of third freewheeling diode, the of the second end of second inductance and AC power source
Two ends are connected.
The fourth object of the present invention is implemented with the following technical solutions:
A kind of Vienna pfc circuit of belt current sampling, by the interleaved converter current sample electricity of one of the object of the invention
Road is applied to Vienna pfc circuit；
The Vienna pfc circuit include A phase two-way interleaved parallel PFC circuit, B phase two-way interleaved parallel PFC circuit and
C phase two-way interleaved parallel PFC circuit, the interleaved converter current sampling circuit are three, respectively the first interleaved converter
Current sampling circuit, the second interleaved converter current sampling circuit and third interleaved converter current sampling circuit；
The A phase two-way interleaved parallel PFC circuit includes the first A phase PFC electricity of A phase AC power source and crisscross parallel
Road and the 2nd A phase pfc circuit, the A phase AC power source are connected to the input of the first A phase pfc circuit and the 2nd A phase pfc circuit
End, the first A phase pfc circuit and the 2nd A phase pfc circuit respectively include the first A phase switching tube and the 2nd A phase switching tube, institute
State the first primary side winding in the first interleaved converter current sampling circuit and the second primary side winding respectively with the first A phase switching tube
It connects to form the first converter and the second converter of the first interleaved converter current sampling circuit with the 2nd A phase switching tube；
The B phase two-way interleaved parallel PFC circuit includes the first B phase PFC electricity of B phase AC power source and crisscross parallel
Road and the 2nd B phase pfc circuit, the B phase AC power source are connected to the input of the first B phase pfc circuit and the 2nd B phase pfc circuit
End, the first B phase pfc circuit and the 2nd B phase pfc circuit respectively include the first B phase switching tube and the 2nd B phase switching tube, institute
State the first primary side winding in the second interleaved converter current sampling circuit and the second primary side winding respectively with the first B phase switching tube
It connects to form the first converter and the second converter of the second interleaved converter current sampling circuit with the 2nd B phase switching tube；
The C phase two-way interleaved parallel PFC circuit includes the first C phase PFC electricity of C phase AC power source and crisscross parallel
Road and the 2nd C phase pfc circuit, the C phase AC power source are connected to the input of the first C phase pfc circuit and the 2nd C phase pfc circuit
End, the first C phase pfc circuit and the 2nd C phase pfc circuit respectively include the first C phase switching tube and the 2nd C phase switching tube, institute
State the first primary side winding in third interleaved converter current sampling circuit and the second primary side winding respectively with the first C phase switching tube
It connects to form the first converter and the second converter of third interleaved converter current sampling circuit with the 2nd C phase switching tube.
Compared with prior art, the beneficial effects of the present invention are:
The present invention takes full advantage of the 180 degree interleaved character of interleaved converter, by the way that electric current is carried out positive and negative arrangement, will adopt
Sample circuit is combined into one, and greatly reduces the device count of interleaved converter current sampling circuit, and is not needed additional auxiliary
Power supply power supply is helped, it is not only at low cost, no-delay, it is suitble to high frequency, high power density application.
Detailed description of the invention
Fig. 1 is the circuit diagram of the current sampling circuit of existing interleaved converter；
Fig. 2 is the circuit diagram of interleaved converter current sampling circuit of the invention；
Fig. 3 is the schematic diagram of interleaved converter current sample control method of the invention；
Fig. 4 is waveform diagram when duty ratio is no more than 50% in Fig. 3；
Fig. 5 is waveform diagram when duty ratio is greater than 50% in Fig. 3；
Fig. 6 is the circuit diagram that interleaved converter current sampling circuit is applied in two-way interleaved parallel PFC circuit；
Fig. 7 is the circuit diagram that interleaved converter current sampling circuit is applied in Vienna pfc circuit.
Specific embodiment
Below with reference to attached drawing, the present invention is described in more detail, it should be noted that lower reference attached drawing is to this
The description that invention carries out is only illustrative, and not restrictive.It can be combined with each other between each difference embodiment, with
Constitute the other embodiments not shown in the following description.
Embodiment one
Shown in referring to figure 2., a kind of interleaved converter current sampling circuit comprising Current Transmit, first switch
S1, second switch S2, power supply and sampling processing circuit；Wherein: Current Transmit includes the first primary side winding, the second original
The first converter, second switch S2 are constituted after side winding and vice-side winding, the first switch S1 and the series connection of the first primary side winding
The second converter is constituted with after the series connection of the second primary side winding, and the both ends of first converter and the second converter are connected to electricity
Source；The sampling processing circuit is connected to the both ends of the vice-side winding.
First converter and the second converter are parallel-connection structure, and the two is staggeredly worked in a manner of 180 ° of phase shift, is
It is realized by way of the phase shift 180 degree of first switch S1 and second switch S2 and is staggeredly worked.
The conducting and shutdown of first switch S1 and second switch S2 carry out periodically on the basis of preset switch periods
The first switch and the second switch that works flows through the electric current of the same direction in adjacent switch periods；Switch periods are much smaller than friendship
The period in galvanic electricity source；Here phase shift 180 degree is a relative concept, and when first switch conducting, corresponding phase range is
When [360n+x, 360n+y], then when second switch is connected in adjacent switch periods corresponding phase range be [360n+t+x,
360n+t+y] or [360n-t+x, 360n-t+y], n be natural number, 0 ° 360 ° of < of < (y-x), 150 °≤t≤210 °, t is preferred
It is 180 °., it is assumed that within 0 °~360 ° this periods, corresponding phase is [50 °, 100 °] when first switch S1 is connected, remaining
Time first switch S1 is in off state, then when second switch S2 is connected in the adjacent switch period corresponding phase be [200 °,
310 °] or [- 160 °, -50 °], when second switch S2 is connected preferably in the adjacent switch period corresponding phase be [230 °,
280 °] or [- 130 °, -80 °], remaining time, second switch S2 was also at off state.
It should be understood that the switch periods of 1, first switch and the second switch are slowly varying within the scope of power frequency；
It 2, is slowly varying within the scope of the duty ratio power frequency of first switch and the second switch；Even if 3, t=180 ° when, first switch
Turn-on time is also not absolutely equal in adjacent switch periods with second switch, but approximately equal.
Power supply uses the AC power source of certain fixed frequency such as 50Hz, which is divided into just half within a time cycle
The time of period and negative half-cycle, positive and negative half period it is equal and wherein half period (such as a positive half period) when form forward direction
Electric current then forms negative current in another half period (such as negative half-cycle).Forward current or negative current flow through first
When converter and the second converter, it is first via electric current referred to here as the electric current for flowing through the first converter, flows through the second converter
Electric current is the second road electric current, then when first via electric current (either forward current or negative current) is from the primary side of the first converter
When the Same Name of Ends of winding flows to different name end, then primary side winding of the second road electric current from the second converter in adjacent switch periods
Different name end flow to Same Name of Ends., whereas if first via electric current (either forward current or negative current) is converted from first
When the different name end of the primary side winding of device flows to Same Name of Ends, then in adjacent switch periods the second road electric current from the second converter
The Same Name of Ends of primary side winding flows to different name end.That is either forward current or negative current, for the first converter and second
For converter, just on the contrary, for example, when power supply is in positive half period by way of primary side winding, it is assumed that shape at this time
At forward current, and the different name by flowing to the first primary side winding when the first primary side winding from the Same Name of Ends of the first primary side winding
End；It is to flow to the second primary side winding from the different name end of the second primary side winding when then the forward current passes through the second primary side winding
Same Name of Ends.It is also such for negative current.
First switch S1 and second switch S2 can use common electronic power switch pipe or two-way switch pipe, including
MOSFET, IGBT, GaN, triode etc., be also possible to thyristor or relay etc. or two or two between them with
The two-way switch of upper composition.This connection type of first switch S1 and second switch S2, Ke Yifang are set in primary side winding
Just realization samples pulse current staggered on first switch S1 and second switch S2.
Sampling processing circuit here and can be not specifically limited there are many form, be flowed through on pair side as long as can obtain
Electric current has enumerated a kind of sampling processing circuit of current sample mode, referring to figure 3. in preferably implementation of the invention
It is shown, sampling processing circuit include first diode D7, the second diode D8, third diode D9, the 4th diode D10 and
The cathode of first resistor, the first diode D7 and third diode D9 are connected to the first end of first resistor, and described
The anode of two diode D8 and the 4th diode D10 is connected to the second end of first resistor, the second diode D8 and
The cathode of four diode D10 is respectively connected to the anode of first diode D7 and third diode D9；The vice-side winding it is same
Name end is connected between the anode of first diode D7 and the cathode of the second diode D8, the different name end connection of the vice-side winding
To third diode D9 anode and the 4th diode D10 cathode between；The second end of the first resistor is grounded, to institute
The electric current stated in first resistor first end is acquired.
The method that electric current in first resistor first end is acquired can be realized by controller, controller can be with
It is realized using dsp processor and its peripheral circuit, it can also be using other real-time signal processors such as FPGA and ARM etc.
It realizes, here without limitation.For example, A/D sampling end (the i.e. sampling letter of dsp processor can be passed through when using dsp processor
Number input terminal) obtain the current signal of sampling processing circuit acquisition.Furthermore it is also possible to control first switch by controller
With the turn-on time of second switch, and then realize adjustment first switch and the second switch duty ratio, reach adjust electric current or
The purpose that circuit is protected.
Its working principle is explained and illustrated below.
Shown in referring to figure 3., first switch S1 and second switch S2 high-frequency work (such as 50kHz i.e. 50 kHz) are at one
Can be flowed through in relatively long time cycle (such as common alternating current power frequency 50Hz i.e. 50 hertz of positive half periods) forward current I1 and
I2, and can be flowed through in (such as common alternating current power frequency 50Hz negative half-cycle) within another time cycle negative current I1 ' and
I2'.For convenience, the situation for flowing through forward current I1 and I2 is only discussed below.
When first switch S1 and second switch S2 flow through the duty ratio of electric current less than 50%, as shown in figure 4, I1 and I2
It for some time simultaneously be voltage after the rectified bridge rectification of 0, CT pair side is two addition of waveforms, when using digitial controller
When DSP samples the voltage of the end Vsense (first end of first resistor), slope of the AD sampling at the end Vsense of DSP can control
The midpoint sample of voltage, and according to counter and timing, can first switch S1 turn-on time midpoint sample to first
The current average of converter, and in the current average of the midpoint sample of second switch S2 turn-on time to the second converter,
The average value via controller of the two electric currents is handled, for controlling the duty ratio or protection of respective switch.
When the duty ratio that first switch S1 and second switch S2 flow through electric current is greater than 50%, as shown in figure 5, I1 and I2
It is superimposed for some time, since the electric current that CT primary side is two opposite directions flows into, the electric current of actually this section superposition is in CT pair
Side forms the effect subtracted each other, therefore the voltage after the rectification of rectified bridge keeps horizontal during time-interleaving, and be not overlapped
Slope current shape is kept in time.
Assuming that the duty ratio of first switch S1 and second switch S2 it is equal (approximately equal) and be not equal to 0 or 100%,
By analysis above it is found that as long as the AD sampling of DSP occurs at the midpoint of first switch S1 or second switch S2 turn-on time
It carves, the current value that AD is sampled is still per the average value of electric current all the way, and the value is only with the electricity of middle point moment CT sample resistance
Corrugating is related, unrelated with the variation of waveform in overlapping time.Therefore, as long as the duty ratio of first switch S1 or second switch S2
It is not 0 or 100%, by the DSP sampling time constant midpoint in first switch S1 and second switch S2 turn-on time, all
The average current value of accurate first converter and the second converter can be sampled.
Feelings due to the symmetry of the circuit, when first switch S1 and second switch S2 flows through negative current I1 ' and I2 '
Shape working condition is similar, repeats no more.
From above structure and working principle: the present invention takes full advantage of the 180 degree interleaved character of interleaved converter,
By the way that electric current is carried out positive and negative arrangement, sample circuit is combined into one, interleaved converter especially pfc circuit electricity is greatly reduced
Flow sample circuit device count, and DSP algorithm and in terms of complexity do not increase, only in terms of timing
Adjustment；Simultaneously as not needing additional accessory power supply and operational amplifier, cost is saved, and current sampling does not prolong
When, it is suitble to higher power density and higher frequency application.
Embodiment two
According to the circuit structure and working principle of embodiment one, the interleaved converter that available embodiment one refers to is electric
The specific current sample control method for flowing sample circuit, mainly comprises the steps that
Obtain the turn-on time of first switch S1 and second switch S2；
By sampling processing circuit at the midpoint of first switch S1 turn-on time and the midpoint of second switch S2 turn-on time
Current acquisition is carried out, so that the average current for just having obtained the first converter (acquires when the midpoint of first switch S1 turn-on time
Current value) and the second converter average current (current value acquired when the midpoint of second switch S2 turn-on time).
Controller is controlled and is calculated according to the obtained average current of sampling, and control amount is exported, to first switch and the
The turn-on time and switch periods of two switches are controlled, and are achieved the purpose that adjust electric current or be protected to circuit.
Embodiment three
Embodiment three shows one interleaved converter current sampling circuit of embodiment in two-way interleaved parallel PFC circuit
Using.
Here the specific appearance form of two-way interleaved parallel PFC circuit is not defined, as long as including the of crisscross parallel
One pfc circuit and the second pfc circuit and the interleaved converter current sampling circuit in embodiment one is applied of the invention
Protection scope, interleaved parallel PFC circuit can be crisscross parallel non-bridge PFC circuits, be also possible to the non-non-bridge PFC of crisscross parallel
Circuit.The AC power source of two-way interleaved parallel PFC circuit provides signal and inputs for the first pfc circuit and the second pfc circuit, and first
Pfc circuit and the second pfc circuit respectively include first switch tube and second switch, first primary side winding and the second primary side
Winding connects to form the first converter and the second converter with first switch tube and second switch respectively.
From the foregoing, it will be observed that in application mode, it can be understood as replace the interleaved converter current sampling circuit of embodiment one
The first switch tube of the first pfc circuit and the second switch of the second pfc circuit are changed, to realize to two-way interleaved parallel PFC electricity
The electric current on road is sampled.
First pfc circuit and the second pfc circuit can sample conventional boosting boost circuit.It can also be using shown in Fig. 6
Structure:
First pfc circuit further includes the first inductance L1, the first sustained diode 1, the second sustained diode 2；Described
Two pfc circuits further include the second inductance L2, third sustained diode 3, the 4th sustained diode 4；First afterflow, two pole
Pipe D1 and the cathode of third sustained diode 3 are connected to the output end of two-way interleaved parallel PFC circuit, second afterflow two
Pole pipe D2 and the cathode of the 4th sustained diode 4 are respectively connected to the first sustained diode 1 and third sustained diode 3
Anode, the plus earth of second sustained diode 2 and the 4th sustained diode 4；The first PFC circuit and second
The output DC side of pfc circuit uses concatenated 5th diode D5 and the 6th diode D6, and the 5th diode D5's is negative
Pole is connected to the output end of two-way interleaved parallel PFC circuit, and the cathode of the 6th diode D6 is connected to the 5th diode D5
Anode, the plus earth of the 6th diode D6；The output end of the first switch tube S1 is connected to the first primary side winding
Different name end, the Same Name of Ends of first primary side winding is connected to the first end of AC power source, the input of the first switch tube
The first end cathode that is connected to the second sustained diode 2 and the first sustained diode 1 of end and the first inductance L1 are just
Between pole, the second end of the first inductance L1 is connected with the second end of AC power source；The output end of the second switch S2
It is connected to the Same Name of Ends of the second primary side winding, the different name end of second primary side winding is connected to the first end of AC power source, institute
The first end of the input terminal and the second inductance L2 of stating second switch is connected to the cathode and of the 4th sustained diode 4
Between the anode of three sustained diodes 3, the second end of the second inductance L2 is connected with the second end of AC power source.
Certainly, the 5th above-mentioned diode D5 and the 6th diode D6 can also be replaced by two capacitors.Two-way
The output end (DC side) of interleaved parallel PFC circuit is additionally provided with capacitor C1 and resistance R3, capacitor C1 and resistance R3 it is in parallel after
First end after second end ground connection, capacitor C1 and resistance R3 parallel connection is connected to the cathode of the 5th diode D5.
Sampling processing circuit uses the structure of embodiment one, to the first end (i.e. the negative pole end of diode D9) of resistance R4
Carrying out signal acquisition can be obtained the average current size of the first pfc circuit and the second pfc circuit, while controller is again to resistance
The voltage of the first end of R3 is acquired, controller by processing voltage and current sampled signal, formed to first switch tube S1 and
Switch periods (duty ratio) control and protection of second switch S2 etc..It is worth noting that in this topology, first switch tube
S1 and second switch S2 shares a current transformer, and circuit is simply at low cost；If first switch tube S1 and second switch
When pipe S2 uses two independent current transformers, current transformer number is at least 2, and due to first switch tube S1
Electric current with second switch S2 is with power frequency two-way flow, and the secondary circuit of current transformer is more complicated, limits reality
Border application.
Example IV
Example IV shows one interleaved converter current sampling circuit of embodiment in the application of Vienna pfc circuit.
Here Vienna pfc circuit itself is not defined, as long as the interleaved converter electric current in embodiment one is adopted
Sample circuit is applied in staggeredly Vienna pfc circuit, within the scope of protection of this application.
It please refers to shown in Fig. 7, staggeredly Vienna pfc circuit includes A phase two-way interleaved parallel PFC circuit, the friendship of B phase two-way
Wrong parallel PFC circuit and C phase two-way interleaved parallel PFC circuit, the interleaved converter current sampling circuit are three, respectively
First interleaved converter current sampling circuit, the second interleaved converter current sampling circuit and third interleaved converter current sample
Circuit.The structure of one of sampling processing circuit in three interleaved converter current sampling circuits is shown in Fig. 7, remaining with
It is identical, substituted here with block diagram.
Three interleaved converter current sampling circuits are respectively applied in the two-way interleaved parallel PFC circuit of three-phase, are had
Body is:
The A phase two-way interleaved parallel PFC circuit includes the first A phase PFC electricity of A phase AC power source and crisscross parallel
Road and the 2nd A phase pfc circuit, the A phase AC power source are connected to the input of the first A phase pfc circuit and the 2nd A phase pfc circuit
End, the first A phase pfc circuit and the 2nd A phase pfc circuit respectively include the first A phase switching tube and the 2nd A phase switching tube, institute
State the first primary side winding in the first interleaved converter current sampling circuit and the second primary side winding respectively with the first A phase switching tube
It connects to form the first converter and the second converter of the first interleaved converter current sampling circuit with the 2nd A phase switching tube.
The B phase two-way interleaved parallel PFC circuit includes the first B phase PFC electricity of B phase AC power source and crisscross parallel
Road and the 2nd B phase pfc circuit, the B phase AC power source are connected to the input of the first B phase pfc circuit and the 2nd B phase pfc circuit
End, the first B phase pfc circuit and the 2nd B phase pfc circuit respectively include the first B phase switching tube and the 2nd B phase switching tube, institute
State the first primary side winding in the second interleaved converter current sampling circuit and the second primary side winding respectively with the first B phase switching tube
It connects to form the first converter and the second converter of the second interleaved converter current sampling circuit with the 2nd B phase switching tube.
The C phase two-way interleaved parallel PFC circuit includes the first C phase PFC electricity of C phase AC power source and crisscross parallel
Road and the 2nd C phase pfc circuit, the C phase AC power source are connected to the input of the first C phase pfc circuit and the 2nd C phase pfc circuit
End, the first C phase pfc circuit and the 2nd C phase pfc circuit respectively include the first C phase switching tube and the 2nd C phase switching tube, institute
State the first primary side winding in third interleaved converter current sampling circuit and the second primary side winding respectively with the first C phase switching tube
It connects to form the first converter and the second converter of third interleaved converter current sampling circuit with the 2nd C phase switching tube.
For controller, three can be used, it is of course also possible to use one shown in Fig. 7, the controller
It may be implemented to be acquired the average current of six switching tubes of three interleaved converter current sampling circuits, can also acquire
The staggeredly output voltage of Vienna pfc circuit.
The staggeredly Vienna pfc circuit common for industry, circuit current sampling mode are that similar background technique is mentioned
Sample resistance add isolation optocoupler scheme, due to there is up to 6 road current samplings, and device is numerous, PCB surface shared by the program product
It is very big, and be easy to be interfered.The scheme mentioned using the present invention, then be reduced to 3 current transformers and relevant sampling
Processing circuit, it is not only at low cost, and also device count is few, does not increase the complexity of control aspect, the processing difficulty of controller is simultaneously
It is not high, thus the interleaved converter current sampling circuit of embodiment one in Vienna PFC using more advantageous.
It will be apparent to those skilled in the art that can make various other according to the above description of the technical scheme and ideas
Corresponding change and deformation, and all these changes and deformation all should belong to the protection scope of the claims in the present invention
Within.
Claims (10)
1. a kind of interleaved converter current sampling circuit characterized by comprising current transformer, first switch, second open
Pass, power supply and sampling processing circuit；Wherein:
The current transformer includes the first primary side winding, the second primary side winding and vice-side winding, the first switch and first
The first converter is constituted after primary side winding series connection, constitutes the second converter after second switch and the series connection of the second primary side winding, it is described
The both ends of first converter and the second converter are connected to power supply；The sampling processing circuit is connected to the vice-side winding
Both ends；
The first switch and the second switch is realized in a manner of phase shift 180 degree staggeredly to work；The power supply is AC power source, the
One switch and second switch flow through forward current or reverse current in a cycle of AC power source, and first switch and second open
Close the electric current that the same direction is flowed through in adjacent switch periods；The switch periods are much smaller than the period of AC power source；It is positive
When electric current or negative current flow through the first converter and the second converter, when electric current all the way is from the primary side winding of the first converter
When Same Name of Ends flows to different name end, then within the adjacent switch period another way electric current from the different name end of the primary side winding of the second converter
Flow to Same Name of Ends.
2. interleaved converter current sampling circuit as described in claim 1, it is characterised in that: the first switch and second is opened
Pass is realized in a manner of phase shift 180 degree staggeredly to work, are as follows:
The conducting and shutdown of the first switch and the second switch carry out periodic duty on the basis of preset switch periods,
When first switch conducting, corresponding phase range is [360n+x, 360n+y], then second switch is led in the adjacent switch period
Corresponding phase range is [360n+t+x, 360n+t+y] or [360n-t+x, 360n-t+y] when logical, and n is natural number, 0 ° of <
(y-x) 360 ° of <, 150 °≤t≤210 °.
3. interleaved converter current sampling circuit as described in claim 1, it is characterised in that: the first switch and second is opened
Pass is any one of MOSFET pipe, IGBT pipe, GaN pipe, triode, thyristor and relay or their combination structure
At two-way switch.
4. interleaved converter current sampling circuit as described in claim 1, it is characterised in that: the sampling processing circuit includes
First diode, the second diode, third diode, the 4th diode and first resistor, the first diode and third
The cathode of diode is connected to the first end of first resistor, and the anode of second diode and the 4th diode is connected to
The cathode of the second end of first resistor, second diode and the 4th diode is respectively connected to first diode and the three or two
The anode of pole pipe；The Same Name of Ends of the vice-side winding is connected between the anode of first diode and the cathode of the second diode,
The different name end of the vice-side winding is connected between the anode of third diode and the cathode of the 4th diode；The first resistor
Second end ground connection, the electric current in the first resistor first end is acquired.
5. interleaved converter current sampling circuit as claimed in claim 4, it is characterised in that: the sampling processing circuit is also wrapped
Controller is included, the sampled signal input of the controller is connected to the first end of the first resistor；The controller is also used
In the turn-on time of control first switch and the second switch.
6. interleaved converter current sampling circuit as claimed in claim 5, it is characterised in that: the controller is DSP processing
Device.
7. a kind of control for carrying out current sample using interleaved converter current sampling circuit described in any one of claims 1-6
Method, it is characterised in that: itself the following steps are included:
Obtain the turn-on time of first switch and the second switch；
Electric current is carried out at the midpoint of first switch turn-on time and the midpoint of second switch turn-on time by sampling processing circuit
Acquisition, respectively obtains the average current of the first converter and the average current of the second converter.
8. a kind of two-way interleaved parallel PFC circuit of belt current sampling, it is characterised in that: will be described in claim any one of 1-6
Interleaved converter current sampling circuit be applied to two-way interleaved parallel PFC circuit in, the two-way interleaved parallel PFC circuit packet
The first pfc circuit and the second pfc circuit of AC power source and crisscross parallel are included, the AC power source is connected to the first PFC electricity
The input terminal on road and the second pfc circuit, first pfc circuit and the second pfc circuit respectively include first switch tube and second
Switching tube, first primary side winding and the second primary side winding connect to form first with first switch tube and second switch respectively
Converter and the second converter.
9. the two-way interleaved parallel PFC circuit of belt current sampling according to claim 8, it is characterised in that: described first
Pfc circuit and the second pfc circuit are boost circuit；
Or first pfc circuit further includes the first inductance, the first freewheeling diode, the second freewheeling diode；Described second
Pfc circuit further includes the second inductance, third freewheeling diode, the 4th freewheeling diode；First freewheeling diode and third
The cathode of freewheeling diode is connected to the output end of two-way interleaved parallel PFC circuit, and second freewheeling diode and the 4th continue
The cathode of stream diode is respectively connected to the anode of the first freewheeling diode and third freewheeling diode, two pole of the second afterflow
The plus earth of pipe and the 4th freewheeling diode；The output DC side of first pfc circuit and the second pfc circuit is using series connection
The 5th diode and the 6th diode, the cathode of the 5th diode is connected to the output of two-way interleaved parallel PFC circuit
End, the cathode of the 6th diode are connected to the anode of the 5th diode, the plus earth of the 6th diode；Described
The output end of one switching tube is connected to the different name end of the first primary side winding, and the Same Name of Ends of first primary side winding is connected to exchange
The first end of the first end of power supply, the input terminal of the first switch tube and the first inductance is connected to the second freewheeling diode
Cathode and the first freewheeling diode anode between, the second end of first inductance is connected with the second end of AC power source；
The output end of the second switch is connected to the Same Name of Ends of the second primary side winding, the different name end connection of second primary side winding
To the first end of AC power source, the first end of the input terminal of the second switch and the second inductance is connected to the 4th afterflow
Between the cathode of diode and the anode of third freewheeling diode, the second end of second inductance and the second end of AC power source
It is connected.
10. a kind of Vienna pfc circuit of belt current sampling, it is characterised in that: by friendship described in any one of claims 1-6
Wrong converter current sample circuit is applied to Vienna pfc circuit；
The Vienna pfc circuit includes A phase two-way interleaved parallel PFC circuit, B phase two-way interleaved parallel PFC circuit and C phase
Two-way interleaved parallel PFC circuit, the interleaved converter current sampling circuit are three, respectively the first interleaved converter electric current
Sample circuit, the second interleaved converter current sampling circuit and third interleaved converter current sampling circuit；
The A phase two-way interleaved parallel PFC circuit include A phase AC power source and crisscross parallel the first A phase pfc circuit and
2nd A phase pfc circuit, the A phase AC power source are connected to the input terminal of the first A phase pfc circuit and the 2nd A phase pfc circuit, institute
It states the first A phase pfc circuit and the 2nd A phase pfc circuit respectively includes the first A phase switching tube and the 2nd A phase switching tube, described first
The first primary side winding and the second primary side winding in interleaved converter current sampling circuit respectively with the first A phase switching tube and second
A phase switching tube connects to form the first converter and the second converter of the first interleaved converter current sampling circuit；
The B phase two-way interleaved parallel PFC circuit include B phase AC power source and crisscross parallel the first B phase pfc circuit and
2nd B phase pfc circuit, the B phase AC power source are connected to the input terminal of the first B phase pfc circuit and the 2nd B phase pfc circuit, institute
It states the first B phase pfc circuit and the 2nd B phase pfc circuit respectively includes the first B phase switching tube and the 2nd B phase switching tube, described second
The first primary side winding and the second primary side winding in interleaved converter current sampling circuit respectively with the first B phase switching tube and second
B phase switching tube connects to form the first converter and the second converter of the second interleaved converter current sampling circuit；
The C phase two-way interleaved parallel PFC circuit include C phase AC power source and crisscross parallel the first C phase pfc circuit and
2nd C phase pfc circuit, the C phase AC power source are connected to the input terminal of the first C phase pfc circuit and the 2nd C phase pfc circuit, institute
It states the first C phase pfc circuit and the 2nd C phase pfc circuit respectively includes the first C phase switching tube and the 2nd C phase switching tube, the third
The first primary side winding and the second primary side winding in interleaved converter current sampling circuit respectively with the first C phase switching tube and second
C phase switching tube connects to form the first converter and the second converter of third interleaved converter current sampling circuit.
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| CN112793632A (en) * | 2021-03-19 | 2021-05-14 | 湖南中车时代通信信号有限公司 | Safety guide device applied to rail transit system and rail transit signal system |
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