CN106655753A - Single-phase bridgeless isolated power factor adjusting circuit - Google Patents
Single-phase bridgeless isolated power factor adjusting circuit Download PDFInfo
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- CN106655753A CN106655753A CN201610986132.5A CN201610986132A CN106655753A CN 106655753 A CN106655753 A CN 106655753A CN 201610986132 A CN201610986132 A CN 201610986132A CN 106655753 A CN106655753 A CN 106655753A
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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
- H02M1/4258—Arrangements for improving power factor of AC input using a single converter stage both for correction of AC input power factor and generation of a regulated and galvanically isolated DC output voltage
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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
Abstract
The invention provides a single-phase bridgeless isolated power factor adjusting circuit. The power factor adjusting circuit comprises an EMI filter, a first diode, a second diode, a first output module, a second output module, a first converter, a second converter, and a control module. The first diode and the second diode are in a reversed series connection, and are in parallel connection with a filtering capacitor. The first converter comprises a primary coil, a first secondary coil and a second secondary coil. The second converter comprises a primary coil, a first secondary coil and a second secondary coil. The control module is used for detecting reference voltage of the first converter and reference voltage of the second converter, obtaining output voltage and input voltage of the power factor adjusting circuit, controlling on and off of a first switch module on the basis of the reference voltage of the first converter and the output voltage and input voltage of the power factor adjusting circuit, and controlling on and off of a second switch module on the basis of the reference voltage of the second converter and the output voltage and input voltage of the power factor adjusting circuit.
Description
Technical field
The present invention relates to power supply technique field, more particularly to it is a kind of it is single-phase without the isolated work(of bridge because of adjustment circuit.
Background technology
Existing single-phase high work(because switched power supply as shown in Figure 1 have two-stage circuit framework, prime for it is non-every
From PFC (Power Factor Correction, power factor correcting) rectifier, rear class be isolated DC to direct current turn
Parallel operation, Fig. 2 and Fig. 3 are conventional circuit framework, and Fig. 2 combines full-bridge type for PFC boost formula AC-DC (AC-DC) rectifier
Phase shift dc-dc, Fig. 3 is that boost type AC-DC rectifiers combine LLC (Logical Link Control, logical links control
System) resonant mode DC-DC (DC-to-dc) converter.PFC boost formula AC-DC rectifier is conventional PFC rectifier circuits, because
It is suitable for global general-use voltage change and alternating voltage can be converted into into 400VdcVoltage, it is easy with high efficiency and control
The advantages of.But existing pfc circuit has following restriction：1st, the conduction loss of the Pfc converter with bridge rectifier compared with
It is high；Although the 2, no bridge type pfc circuit can improve diode rectifier conducting and damage, its circuit framework is transless electricity
Road framework；3rd, boost type Pfc converter due to DC output side be bulky capacitor, therefore alternating voltage be input into moment to this direct current
Capacity charge, easily causes at a relatively high input current, causes rectifier and output diode failure, DC voltage also easily to be filled
Electricity is too high and cause main (PCC) power to damage；4th, in primary side, the control of DC-DC converter is secondary for the control of PFC
Side, therefore control circuit needs a secondary side to separate so that control circuit is complex.
The content of the invention
Present invention seek to address that control circuit needs a secondary side to separate so that control circuit is complex in prior art
Technical problem, there is provided a kind of control circuit it is simple it is single-phase without the isolated work(of bridge because of adjustment circuit.
The present invention provide it is a kind of it is single-phase without the isolated work(of bridge because of adjustment circuit, the work(includes because of adjustment circuit：
Electromagnetic interface filter, respectively with the positive pole and negative pole for being connected input voltage, for by work(because of the input voltage of adjustment circuit
Interference signal filtered, wherein electromagnetic interface filter includes the first inductance for being sequentially connected in series, filter capacitor and the second inductance；
First diode and the second diodes in reverse series and in parallel with the filter capacitor；
First output module and the second output module；
First converter includes primary coil, the first secondary coil and second subprime coil, wherein the primary coil
The negative electrode connection of first end and the first diode, the first secondary coil is connected and for output work because of adjustment with the first output module
The output voltage of circuit, second subprime coil is used for the reference voltage of the first converter of output；
Second converter includes primary coil, the first secondary coil and second subprime coil, wherein the primary coil
The negative electrode connection of the second end and the second diode, the first secondary coil is connected and for output work because of adjustment with the second output module
The output voltage of circuit, second subprime coil is used for the reference voltage of the second converter of output；
First switch module has input, output end and control end, wherein in the input and the first converter just
The second end connection of level coil, output end is connected with the anode of the first diode；
Second switch module, with input, output end and control end, wherein the input respectively with the second converter
The first end connection of middle primary coil, output end anode respectively with the first diode, the anode of the second diode and first are opened
Close the output end connection of module；
Control module, control end respectively with first switch module, the control end of second switch module, the first converter
The first secondary coil and second subprime coil connection of the first secondary coil and second subprime coil and the second converter, is used for
According to the reference voltage and the reference voltage of the second converter of the first converter of detection, the work(is obtained because of the output of adjustment circuit
Voltage and input voltage, and according to the reference voltage and work(of the first converter because of the output voltage of adjustment circuit and input electricity
The conducting and disconnection of voltage-controlled first switch module processed, and it is defeated because of adjustment circuit according to the reference voltage and work(of the second converter
Go out the conducting and disconnection of voltage and input voltage control second switch module
Compared with prior art, beneficial effect is technical scheme：Controlled in primary side by control module
First switch module conducting and disconnect and primary side control second switch module conducting and disconnection, therefore control
Module need not carry out separation control in primary side and secondary side so that it is single-phase without the isolated work(of bridge because adjustment circuit structure letter
It is single and cost-effective.
Description of the drawings
Fig. 1 is existing single-phase high work(because of switched power supply；
Fig. 2 is that PFC boost formula AC-DC rectifier combines full-bridge type phase shift dc-dc；
Fig. 3 is that boost type AC-DC rectifiers combine LLC resonant mode dc-dcs；
Fig. 4 be the present invention it is single-phase without the isolated work(of bridge because of a kind of circuit diagram of embodiment of adjustment circuit；
Fig. 5 is the work wave of circuit control module between civil power positive half period of Fig. 4；
Fig. 6 a be the present invention it is single-phase without the isolated work(of bridge because of a kind of fundamental diagram of embodiment of adjustment circuit；
Fig. 6 b be the present invention it is single-phase without the isolated work(of bridge because adjustment circuit another kind embodiment fundamental diagram；
Fig. 6 c be the present invention it is single-phase without the isolated work(of bridge because of the fundamental diagram of another embodiment of adjustment circuit；
Fig. 6 d be the present invention it is single-phase without the isolated work(of bridge because of the fundamental diagram of adjustment circuit another embodiment；
Fig. 7 be the present invention it is single-phase without the isolated work(of bridge because adjustment circuit another kind embodiment circuit diagram；
Fig. 8 is the work wave of circuit control module between civil power positive half period of Fig. 7；
Fig. 9 is work wave when carrying out emulating positive half cycle because of adjustment circuit without the isolated work(of bridge single-phase to the present invention.
Figure 10 is the work wave emulated because of adjustment circuit without the isolated work(of bridge single-phase to the present invention.
Specific embodiment
The specific embodiment of the present invention is described further below in conjunction with the accompanying drawings.
The present invention provide a kind of embodiment it is single-phase without the isolated work(of bridge because of adjustment circuit, as shown in figure 4, the work(is because adjusting
Whole circuit includes：
EMI (Electro Magnetic Interference electromagnetic interferences) wave filter 100, is input into electricity with being connected respectively
The positive pole and negative pole of pressure Vs, for, because the interference signal of the input voltage Vs of adjustment circuit is filtered, wherein EMI to be filtered by work(
Device 100 includes the first inductance Ls1, filter capacitor Cs and the second inductance Ls2 being sequentially connected in series；
First diode D1 and the second diode D2 differential concatenations and in parallel with the filter capacitor；
First output module 200 and the second output module 300, wherein the first output module includes the first output diode
The outputs of Do1 and first；
First converter 400 includes primary coil, the first secondary coil and second subprime coil, wherein the primary coil
The diode D1 of first end 401 and first negative electrode connection, the first secondary coil is connected and for defeated with the first output module 200
Go out work(because of the output voltage Vo of adjustment circuit, second subprime coil is used for the reference voltage Vaux1 of the first converter 400 of output；
Second converter 500 includes primary coil, the first secondary coil and second subprime coil, wherein the primary coil
The second end 502 and the second diode D2 negative electrode connection, the first secondary coil is connected and for defeated with the second output module 300
Go out work(because of the output voltage Vo of adjustment circuit, second subprime coil is used for the reference voltage Vaux2 of the second converter 500 of output；
First switch module Q1 has input, output end and control end, wherein the input and the first converter 400
Second end 402 of middle primary coil connects, and output end is connected with the anode of the first diode D1；
Second switch module Q2 has input, output end and control end, wherein the input is changed respectively with second
The first end 501 of primary coil connects in device 500, output end anode respectively with the first diode D1, the second diode D2
The output end connection of anode and first switch module Q1；
Control module, control end respectively with first switch module Q1, the control end of second switch module Q2, the first conversion
First secondary coil and second subprime coil of device 400 and first secondary coil and second subprime line of the second converter 500
Circle connection, for according to the reference voltage of the reference voltage Vaux1 of the first converter 400 of detection and the second converter 500
Vaux2, obtains the work(because of the output voltage Vo and input voltage Vs of adjustment circuit, and according to the ginseng of the first converter 400
Examine voltage Vaux1 and work(because adjustment circuit output voltage Vo and input voltage Vs control first switch module Q1 conducting and
Disconnect, and according to the reference voltage Vaux2 and work(of the second converter 500 because of the output voltage Vo and input voltage of adjustment circuit
The conducting and disconnection of Vs control second switch modules Q2.
By the way that control module control is in the conducting of first switch module Q1 of primary side and disconnects and in the control of primary side
The conducting and disconnection of second switch module Q2 processed, therefore control module need not carry out separation control in primary side and secondary side,
So that it is single-phase without the isolated work(of bridge because of the simple structure of adjustment circuit and cost-effective.
In being embodied as, the first output module 200 includes the first output diode Do1 and the first output capacitance Co1, the
One end of one output diode Do1 is connected with the first end of the first secondary coil in the first converter 400, the first output diode
The other end of Do1 is connected with one end of the first output capacitance Co1, the other end of the first output capacitance Co1 and the first converter 400
In the first secondary coil the second end connection, the voltage at the first output capacitance Co1 two ends is the output voltage of the first converter 400
Vo1；
Second output module 300 includes the second output diode Do2 and the second output capacitance Co2, the second output diode
One end of Do2 is connected with the first end of the first secondary coil in the second converter 500, the other end of the second output diode Do2
It is connected with one end of the second output capacitance Co2, first level in the other end of the second output capacitance Co2 and the second converter 500
The second end connection of coil, the voltage at the second output capacitance Co2 two ends is the output voltage Vo2 of the second converter 500.First turn
The output voltage Vo1 of parallel operation 400 obtains work(because of the input voltage of adjustment circuit plus the output voltage Vo2 of the second converter 500
Vo。
In being embodied as, as shown in figure 4, the work(also includes for reducing first switch module Q because of adjustment circuit
First buffer module 700 of voltage jump and the second buffer module 800 for reducing the voltage jump of second switch module, institute
The one end for stating the first buffer module 700 is connected with the negative electrode of the first diode D1, the other end point of first buffer module 700
It is not connected with the second end of primary coil in the input and the first converter 400 of first switch module Q1, the second buffer module
800 one end is connected with the negative electrode of the second diode D2, the other end of second buffer module 800 respectively with second switch mould
The first end connection of primary coil in the input of block Q2 and the second converter 500.
Specifically, first buffer module 700 includes the first buffering electric capacity C11, first resistor R11 and the first buffering two
Pole pipe D11, one end one end respectively with first resistor R11 of the first buffering electric capacity C11 and the negative electrode of the first diode D1
Connection, it is described first buffering electric capacity C11 the other end respectively with the other end and the first buffering diode D11 of first resistor R11
Negative electrode connection, the anode of the first buffering diode D11 input respectively with first switch module Q1 and the first conversion
The second end connection of primary coil in device 400.Second buffer module 800 includes the second buffering electric capacity C12, second resistance
R12 and the second buffering diode D12, it is described second buffering electric capacity C12 one end respectively with one end and second of second resistance R12
Diode D2 negative electrode connection, it is described second buffering electric capacity C12 the other end respectively with the other end and second of second resistance R12
The negative electrode connection of buffering diode D12, the anode of the second buffering diode D12 respectively with the input of second switch module Q2
The first end connection of primary coil in end and the second converter 500.
In being embodied as, as shown in fig. 7, the control module includes：
Voltage control circuit 601, for according to work(because of the input voltage Vo and input voltage Vs and benchmark of adjustment circuit
Voltage Voref output control voltage signals；
First zero current detecting module ZCD1, for being led according to the reference voltage Vaux1 of the first converter 400 outputs first
Messenger；
First conducting control module 603, for the first Continuity signal to be exported to first switch module Q1 and according to described
Control voltage signal Vcon and the first Continuity signal export the first control signal VG1 with control first switch module Q1 conducting and
Disconnect；
Second zero current detecting module ZCD2, for being led according to the reference voltage Vaux2 of the second converter 500 outputs second
Messenger；
Second conducting control module 605, for the second Continuity signal to be exported to second switch module Q2 and according to described
Control voltage signal Vcon and the second Continuity signal export the second control signal VG2 with control second switch module Q2 conducting and
Disconnect.
Specifically, the first converter 400 and the second converter 500 are specially direction flyback converter, direction flyback converter
Primary side is differential concatenation, and the secondary side of direction flyback converter is positive series connection, and the first diode D1 and the second diode D2 is
Low frequency switches, and for positive and negative half period connection civil power loop is provided.In addition, in order to the current lead-through for reducing (PCC) power is damaged, while
Exempt diode reply current loss so that it is single-phase without the isolated work(of bridge because adjustment circuit operates in boundary conduction mode BCM.
And the control framework of two direction flyback converters is identical, between civil power positive half period, the only action of the first converter 400, otherwise
Between civil power negative half-cycle, the only action of the second converter 500.First converter 400 and the second converter 500 are by the first conducting
Control module 603 or second turns on control module 605 come during the conducting for adjusting first switch module Q1 and second switch module Q2
Between adjust the ON time of first switch module Q1 and second switch module Q2 by controlling ON time method, and first
Switch module Q1 and second switch module Q2 to begin to turn on the time then electric by the first zero current detecting module ZCD1 or the 2nd 0
Stream detecting module ZCD2 is determined so that first switch module Q1 and second switch module Q2 are the two of direction flyback converter secondary side
Pole pipe electric current begins to turn on when dropping to zero, allows circuit operation in boundary conduction mode BCM, reduces the reply loss of diode.
The ON time Ton of first switch module Q1 and second switch module Q2 is then by the first converter 400 and the second converter 500
Common output voltage Vo determines that detection output voltage Vo obtains output voltage back voltage Vofb and adjusted by voltage control circuit 601
Control voltage signal Vcon is obtained after whole, this control voltage signal Vcon will respectively with the first conducting control module ZCD1 and the
Sawtooth signal inside two conducting control modules ZCD2 compares to determine first switch module Q1 and second switch module Q2
ON time.
In being embodied as, Fig. 5 is the work wave of the control module between civil power positive half period.Fig. 6 a are single-phase for the present invention
Without the isolated work(of bridge because of a kind of fundamental diagram of embodiment of adjustment circuit.Fig. 6 b for the present invention it is single-phase without the isolated work(of bridge because adjust
The fundamental diagram of whole circuit another kind embodiment.Fig. 6 b for the present invention it is single-phase without the isolated work(of bridge because adjustment circuit is another kind of real
Apply the fundamental diagram of example.Fig. 6 c be the present invention it is single-phase without the isolated work(of bridge because of the operation principle of another embodiment of adjustment circuit
Figure.Fig. 6 d be the present invention it is single-phase without the isolated work(of bridge because of the fundamental diagram of adjustment circuit another embodiment.As shown in Figure 6 a,
For first switch module Q1 turn on transformer energy storage pattern, in the positive half period of civil power, now when first switch module Q1 is led
When logical, Vs-Ls1-Tr1-Q1-D2-Ls2 forms a guiding path, now the self-induction storage of the transformer Tr1 of the first converter 400
Can, switching current IQ1 linear rises (during Ton as shown in Figure 5).As shown in Figure 6 b, the first diode D1 conductings transformer
The pattern of energy is released, in the positive half period of civil power, when first switch module Q1 disconnects, Vs-Ls1-Cs-Ls2 forms a guiding path
Footpath, and Tr1-Do1-Vo1 forms a guiding path, the now self-induction energy storage of the transformer Tr1 of the first converter 400 will be released to
Load, diode current IDo1 linear declines (during Toff as shown in Figure 5).In addition, by the low of Ls1-Cs-Ls2 formation
Bandpass filter is electromagnetic interface filter, the sine wave that mains current can be made to be low distortion, reaches work(because of the purpose corrected.In civil power
The mode of operation of negative half period is identical with positive half cycle, is the pattern of second switch module Q2 conducting transformer energy storage as fig. 6 c,
And as shown in fig 6d, the second diode D2 conducting transformers release the pattern of energy.
In being embodied as, the first zero current detecting module ZCD1 includes the first divider resistance R1, the second partial pressure electricity
Resistance R2 and first comparator 602, the second subprime coil of one end of the first divider resistance R1 and first converter 400
Reference edge 403 connect and for receiving the reference voltage of first converter 400, the first divider resistance R1's is another
End is connected respectively with one end of the second divider resistance R2 and the positive pole of first comparator 602 connects, and the second divider resistance R2's is another
The negative pole of one end and first comparator 602 is grounded respectively, and the output end of the first comparator 602 and the described first conducting are controlled
Module 603 connects.
The first conducting control module 603 includes the first rest-set flip-flop RS1, the 3rd comparator A1, the first control electric capacity
Ct1, the first current source Ich1, first switch unit Q11 and the first reverser B1, the first of the first rest-set flip-flop RS1 is defeated
Enter end to be connected with the output end of first comparator 602 in the first zero current detecting module ZCD1, first rest-set flip-flop
Second input of RS1 is connected with the output end of the 3rd comparator A1, and the output end of the first rest-set flip-flop RS is respectively with
One end of the control end of one switch module Q1 and the first reverser B1 connects and for exporting the first Continuity signal and the first shut-off
Signal, the positive pole of the 3rd comparator A1 controls respectively one end of electric capacity Ct1, one end and first of the first current source Ich1 with first
The input connection of switch element Q11, the other end, the other end and first of the first current source Ich1 of the first control electric capacity Ct1
The output end of switch element Q11 is grounded respectively, and the control end of first switch unit Q11 connects with the other end of the reverser B1
Connect, the negative pole of the 3rd comparator A1 is connected and for receiving control voltage signal Vcon with the voltage control circuit 601.
The second zero current detecting module ZCD2 compares including the 3rd divider resistance R3, the 4th divider resistance R4 and second
Device 604, one end and the reference edge 404 of the second subprime coil of second converter 500 of the 3rd divider resistance R3 connect
Connect and for receiving the reference voltage Vaux2 of second converter, the other end of the 3rd divider resistance R3 is respectively with
One end connection of four divider resistance R4 and the positive pole of the second comparator 604 connect, the other end and second of the 4th divider resistance R4
The negative pole of comparator 604 is grounded respectively, and the output end of second comparator 604 connects with the described second conducting control module 605
Connect.
The second conducting control module 605 includes the second rest-set flip-flop RS2, the 4th comparator A2, the second control electric capacity
Ct2, the second current source Ich2, second switch unit Q12 and the second reverser B2, the first of the second rest-set flip-flop RS2 is defeated
Enter end to be connected with the output end of the second comparator 604 in the second zero current detecting module ZCD1, second rest-set flip-flop
Second input of RS2 is connected with the output end of the 4th comparator A2, and the output end of the second rest-set flip-flop RS2 is respectively with
One end of the control end of two switch module Q2 and the second reverser B2 connects and for exporting the second Continuity signal and the second shut-off
Signal, the positive pole of the 4th comparator A2 controls respectively one end of electric capacity Ct2, one end and second of the second current source Ich2 with second
The input connection of switch element Q12, the other end, the other end and second of the second current source Ich2 of the second control electric capacity Ct2
The output end of switch element Q12 is grounded respectively, and the control end of second switch unit Q12 connects with the other end of the reverser B2
Connect, the negative pole of the 4th comparator A2 is connected and for receiving control voltage signal with the voltage control circuit 601.It is wherein described
The capacitance of the first control electric capacity Ct1 is identical with the capacitance of the second control electric capacity Ct2.
The voltage control circuit 601 includes subtracter E1, error amplifier GV, absolute value block E2 and work(because of controller
E3, the positive pole of the subtracter E1 is connected with reference voltage V oref, and the negative pole of the subtracter E1 is with the work(because of adjustment circuit
Output voltage Vo connections, the output end of the subtracter E1 be connected with the input of the error amplifier GV, described absolute
The input of value module E2 with the work(because the input voltage Vs of adjustment circuit is connected, because of the input of controller distinguish by the work(
With the work(because the output end of the output voltage Vo, the output end of absolute value block E2 and error amplifier GV of adjustment circuit is connected
And for according to the work(because the output voltage Vo of adjustment circuit, the work(are because of the input voltage absolute value of adjustment circuit and described
The output voltage of error amplifier GV generates control voltage signal Vcon and obtains unity power factor.
Fig. 7 be the present invention it is single-phase without the isolated work(of bridge because adjustment circuit another kind embodiment circuit diagram.Fig. 8 is Fig. 7's
The work wave of circuit control module between civil power positive half period.Due in input voltage positive-negative half-cycle, the He of the first converter 400
The operation principle of the second conversion 500 is identical, is only illustrated with positive half cycle below.First converter 400 and the second converter 500
Transformer is also the first converter 400 and the second converter 500 with one group of reference coil in addition to main coil and output winding
Transformer include primary coil, the first secondary coil and second subprime coil, the output voltage Vaux1 of second subprime coil,
Vaux2 respectively for the zero current of first comparator 602 and second of offer to the first zero current detecting module ZCD1 detect by Jing partial pressures
The second comparator 604 of module ZCD2 is surveyed as during switch module disconnects, detecting diode current drops to for zero time,
When electric current drops to zero, the output signal of the comparator 604 of first comparator 602 and second is exported to the triggering of corresponding rest-set flip-flop
Switch module, such as, first comparator 602 causes first switch module Q1 to begin to turn on, now the first conducting control module 603
Internal current source Ich charges to the first control electric capacity Ct1 makes sawtooth waveforms Vt1 linear rises, until sawtooth waveforms Vt1 rise to it is super
Control voltage signal Vcon moment is spent, the output signal of this 3rd comparator A1 will reset the first rest-set flip-flop RS1 upsets and make the
One switch module Q1 disconnects.During first switch module Q1 disconnects, the output military order of the first rest-set flip-flop RS1 is controlled with first
First switch unit Q11 conductings electric capacity Ct1 in parallel so that sawtooth waveforms Vt1 voltages are zero during first switch module Q1 disconnects,
Until the first zero current detecting module ZCD1 detects zero current, first switch module Q1 is turned on again, the first control electric capacity Ct1
Started to charge up by no-voltage again.
Specifically, control voltage signal Vcon be by produced by voltage control circuit 601, its utilize back voltage Vofb with
Reference voltage V oref is adjusted to error amplifier GV through subtracter E1 process outputs, then with back voltage Vofb and defeated
The absolute value three for entering voltage Vs obtains control voltage signal Vcon after work(is because of controller E3 process.Work(is because controller E3's
Purpose be make input current Is for pure sine wave and with input voltage Vs homophases, the power factor for making input side levels off to " 1 ".
Specifically, by taking the control to first switch module Q1 as an example, because the peak value of first switch module Q1 electric current is：
Wherein Lp for transformer self-inductance, and during due to Ton times in being Fig. 5 in the ton times, sawtooth waveforms Vt1 meetings
Control voltage signal Vcon is risen to, therefore：
Wherein Ct is the capacitance of the control electric capacity Ct2 of the first control electric capacity Ct1 or second, and Ich is the electric current of current source Ich
Value.Then (2) substitution (1) can be obtained：
If unity power factor to be obtained, Vs and Is are represented by：
Vs=VsmSin ω t, Is=Ismsinωt (4)
Wherein w refers to supply frequency, and t refers to the time, and wt is the meaning of angle, and Ism refers to that electric current shakes good fortune, and Vsm refers to voltage amplitude good fortune, and this is
Typically represent the expression of supply voltage and electric current.
Due to first switch module Q1 electric current through being input into low pass filter filtering after can obtain input current Is, therefore by
First switch module Q1 completes the switching time of a cycle, can obtain the current average of first switch module Q1：
Wherein D (t) is dutycycle of the switch in line voltage angle t, and first completes year.In addition for operating in BCM
The direction flyback converter of pattern, its output voltage is with the relation of input voltage：
Wherein the turn ratio of N indication transformers, can obtain followed by (6)：
Formula (7) is substituted into into formula (5) can obtain：
Can be obtained by formula (3) and formula (8)：
Therefore, the work(of Fig. 7 because controller E3 according to formula (9) come produce control voltage Vcon with obtain unit power because
Son.
In concrete operations, by being input into the circuit of 220Vrms, output 400Vdc, 200W nominal load being verified
It is single-phase without the isolated work(of bridge because of adjustment circuit, the parameter of circuit is as follows：
N=1, Lp=200 μ H, Ich=1mA, Ct1=Ct2=5nF,
Ls1=Ls2=1mH, Cs=1 μ F, Co1=Co2=200 μ F
As shown in FIG. 9 and 10, Fig. 9 show switching current IQ1, diode current in positive half cycle to analog result
IDo1, zero current detection signal ZCD1 waveforms and Vt1 and Vcon waveforms, it is electric that waveform shows that result shows that it can reach zero really
Stream detecting action causes converters operation in boundary conduction mode.Figure 10 show the waveform of each part of artificial circuit, its display
As a result show that really interaction is turned on two converters between positive-negative half-cycle, input voltage and electric current are homophase, and input current is
Low distortion, input power because of defeated close " 1 ", output voltage also can be adjusted it is stable in 400V, these verify carry without bridge every
From formula converter circuit and its validity of control circuit.
Merely illustrating the principles of the invention described in above-described embodiment and specification and most preferred embodiment, without departing from this
On the premise of spirit and scope, the present invention also has various changes and modifications, and these changes and improvements both fall within requirement and protect
In the scope of the invention of shield.
Claims (10)
1. it is a kind of it is single-phase without the isolated work(of bridge because of adjustment circuit, it is characterised in that：
Electromagnetic interface filter, respectively with the positive pole and negative pole for being connected input voltage, for the doing because of the input voltage of adjustment circuit by work(
Disturb signal to be filtered, wherein electromagnetic interface filter includes the first inductance being sequentially connected in series, filter capacitor and the second inductance；
First diode and the second diodes in reverse series and in parallel with the filter capacitor；
First output module and the second output module；
First converter includes primary coil, the first secondary coil and second subprime coil, wherein the first of the primary coil
The negative electrode of end and the first diode connects, and the first secondary coil is connected and for output work because of adjustment circuit with the first output module
Output voltage, second subprime coil be used for output the first converter reference voltage；
Second converter includes primary coil, the first secondary coil and second subprime coil, wherein the second of the primary coil
The negative electrode of end and the second diode connects, and the first secondary coil is connected and for output work because of adjustment circuit with the second output module
Output voltage, second subprime coil be used for output the second converter reference voltage；
First switch module has input, output end and control end, wherein primary line in the input and the first converter
The second end connection of circle, output end is connected with the anode of the first diode；
Second switch module, with input, output end and control end, wherein the input is first with the second converter respectively
The first end connection of level coil, output end anode respectively with the first diode, the anode of the second diode and first switch mould
The output end connection of block；
Control module, control end respectively with first switch module, the control end of second switch module, the first of the first converter
The first secondary coil and second subprime coil connection of secondary coil and second subprime coil and the second converter, for basis
The reference voltage of the first converter and the reference voltage of the second converter are detected, the work(is obtained because of the output voltage of adjustment circuit
And input voltage, and the output voltage and input voltage control according to the reference voltage and work(of the first converter because of adjustment circuit
The conducting and disconnection of first switch module processed, and according to the reference voltage and work(of the second converter because of the output electricity of adjustment circuit
Pressure and input voltage control the conducting and disconnection of second switch module.
2. work(as claimed in claim 1 is because of adjustment circuit, it is characterised in that：The control module includes：
Voltage control circuit, for according to work(because of the output voltage and input voltage and reference voltage output control of adjustment circuit
Voltage signal；
First zero current detecting module, for according to the Continuity signal of reference voltage output first of the first converter；
First conducting control module, with the first Continuity signal is exported to first switch module and according to the control voltage signal
Export the first control signal to control the conducting and disconnection of first switch module with the first Continuity signal；
Second zero current detecting module, for according to the Continuity signal of reference voltage output second of the second converter；
Second conducting control module, believes for the second Continuity signal to be exported to second switch module and according to the control voltage
Number and the second Continuity signal export the second control signal to control the conducting and disconnection of second switch module.
3. work(as claimed in claim 2 is because of adjustment circuit, it is characterised in that：The first zero current detecting module includes first
Divider resistance, the second divider resistance and first comparator, one end of first divider resistance and the of first converter
The reference edge of secondary stage coil connects and for receiving the reference voltage of first converter, first divider resistance it is another
One end be connected with one end of the second divider resistance respectively and first comparator positive pole connection, the other end of the second divider resistance and
The negative pole of first comparator is grounded respectively, and the output end of the first comparator is connected with the described first conducting control module.
4. work(as claimed in claim 3 is because of adjustment circuit, it is characterised in that：The first conducting control module includes a RS
Trigger, the 3rd comparator, the first control electric capacity, the first current source, first switch unit and the first reverser, a RS
The first input end of trigger is connected with the output end of first comparator in the first zero current detecting module, a RS
Second input of trigger is connected with the output end of the 3rd comparator, and the output end of first rest-set flip-flop is respectively with first
One end of the control end of switch module and the first reverser connects and for exporting the first Continuity signal and the first cut-off signals, the
The input of one end, one end of the first current source and first switch unit that the positive pole of three comparators controls electric capacity with first respectively
Connection, the output end of the other end, the other end of the first current source and first switch unit of the first control electric capacity is grounded respectively, the
The control end of one switch element is connected with the other end of the reverser, negative pole and the voltage control circuit of the 3rd comparator
Connect and for receiving control voltage signal.
5. work(as claimed in claim 4 is because of adjustment circuit, it is characterised in that：The second zero current detecting module includes the 3rd
Divider resistance, the 4th divider resistance and the second comparator, one end of the 3rd divider resistance and the of second converter
The reference edge of secondary stage coil connects and for receiving the reference voltage of second converter, the 3rd divider resistance it is another
One end be connected with one end of the 4th divider resistance respectively and the second comparator positive pole connection, the other end of the 4th divider resistance and
The negative pole of the second comparator is grounded respectively, and the output end of second comparator is connected with the described second conducting control module.
6. work(as claimed in claim 5 is because of adjustment circuit, it is characterised in that：The second conducting control module includes the 2nd RS
Trigger, the 4th comparator, the second control electric capacity, the second current source, second switch unit and the second reverser, the 2nd RS
The first input end of trigger is connected with the output end of the second comparator in the second zero current detecting module, the 2nd RS
Second input of trigger is connected with the output end of the 4th comparator, and the output end of second rest-set flip-flop is respectively with second
One end of the control end of switch module and the second reverser connects and for exporting the second Continuity signal and the second cut-off signals, the
The input of one end, one end of the second current source and second switch unit that the positive pole of four comparators controls electric capacity with second respectively
Connection, the output end of the other end, the other end of the second current source and second switch unit of the second control electric capacity is grounded respectively, the
The control end of two switch elements is connected with the other end of the reverser, negative pole and the voltage control circuit of the 4th comparator
Connect and for receiving control voltage signal.
7. work(as claimed in claim 6 is because of adjustment circuit, it is characterised in that：The capacitance and second of the first control electric capacity
The capacitance of control electric capacity is identical.
8. the work(as described in claim 1-7 any one is because of adjustment circuit, it is characterised in that：The voltage control circuit includes
Subtracter, error amplifier, absolute value block and work(are because of controller, and the positive pole of the subtracter is connected with reference voltage, described
The negative pole of subtracter with the work(because the output voltage of adjustment circuit is connected, with the error amplify by the output end of the subtracter
Device input connection, the input of the absolute value block with the work(because the input voltage of adjustment circuit is connected, the work(
Because the input of controller is respectively with the work(because the output voltage of adjustment circuit, the output end of absolute value block and error are amplified
The output end of device connect and for according to the work(because output voltage, the work(of adjustment circuit is because of the input voltage of adjustment circuit
The output voltage of absolute value and the error amplifier generates the control voltage signal and obtains unity power factor.
9. work(as claimed in claim 1 is because of adjustment circuit, it is characterised in that：The work(includes for reducing by the because of adjustment circuit
First buffer module of the voltage jump of one switch module and the second buffering for reducing the voltage jump of second switch module
Module, one end of first buffer module is connected with the negative electrode of the first diode, the other end point of first buffer module
It is not connected with the second end of primary coil in the input and the first converter of first switch module, one end of the second buffer module
Be connected with the negative electrode of the second diode, the other end of second buffer module respectively with the input and of second switch module
The first end connection of primary coil in two converters.
10. work(as claimed in claim 9 is because of adjustment circuit, it is characterised in that：First buffer module includes the first buffering
Electric capacity, first resistor and the first buffering diode, one end of the first buffering electric capacity respectively with one end of first resistor and the
The negative electrode connection of one diode, the other end of the first buffering electric capacity buffers two with the other end and first of first resistor respectively
The negative electrode connection of pole pipe, the anode of the first buffering diode respectively with the input and the first converter of the first switch module
The second end connection of middle primary coil；
Second buffer module includes the second buffering electric capacity, second resistance and the second buffering diode, the second buffering electricity
One end of appearance is connected respectively with one end of second resistance and the negative electrode of the second diode, the other end point of the second buffering electric capacity
Be not connected with the other end of second resistance and the negative electrode of the second buffering diode, the anode of the second buffering diode respectively with it is described
The first end connection of primary coil in the input of second switch module and the second converter.
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| CN201610986132.5A CN106655753B (en) | 2016-11-09 | 2016-11-09 | The single-phase no isolated function of bridge of one kind is because of adjustment circuit |
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| CN201610986132.5A CN106655753B (en) | 2016-11-09 | 2016-11-09 | The single-phase no isolated function of bridge of one kind is because of adjustment circuit |
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| CN106655753B CN106655753B (en) | 2019-06-21 |
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Cited By (1)
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| TWI655837B (en) * | 2017-09-21 | 2019-04-01 | 日商歐姆龍股份有限公司 | Insulated bidirectional DC/DC converter and control method of insulated bidirectional DC/DC converter circuit |
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| CN106655753B (en) | 2019-06-21 |
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