CN106877677A - A kind of converter control circuit being self-regulated with bi-directional synchronization rectification and dead band - Google Patents
A kind of converter control circuit being self-regulated with bi-directional synchronization rectification and dead band Download PDFInfo
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- CN106877677A CN106877677A CN201710227969.6A CN201710227969A CN106877677A CN 106877677 A CN106877677 A CN 106877677A CN 201710227969 A CN201710227969 A CN 201710227969A CN 106877677 A CN106877677 A CN 106877677A
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
-
- 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
- H02M1/38—Means for preventing simultaneous conduction of switches
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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
- H02M1/0003—Details of control, feedback or regulation circuits
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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)
- Power Engineering (AREA)
- Rectifiers (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of converter control circuit being self-regulated with bi-directional synchronization rectification and dead band, including symmetrical Va lateral circuits and Vb lateral circuits.The beneficial effects of the invention are as follows：1st, the present invention is in two-way DC/DC conversion, carried out under two-way changing using LLC topologys, current zero-crossing point can be judged in the case of two-way changing, increase filters first erroneous judgement of zero crossing, while using PWM controls, improve rectification secondary side in the switching characteristic in perceptual region capacitive area rectifying tube and, MOS body diode reverses recover the influence for causing, for controlling, high-low pressure occasion is more suitably applied to traditional synchronous rectification IC, its range of application is wider.While realizing that two-way DC/DC counnter attacks are filled, its current detecting can be utilized to realize the regulation of Dead Time again, this solves the problems, such as that ZVS Sofe Switch may not be realized under LLC maximum conditions, improves circuit efficiency, circuit EMC is improved, circuit reliability is also substantially increased.
Description
Technical field
It is specifically a kind of to be self-regulated with bi-directional synchronization rectification and dead band the present invention relates to a kind of converter control circuit
Converter control circuit.
Background technology
Used as the conversion for realizing different DC voltages, general traditional DC/DC converters are unidirectional conversion to DC/DC converters
And the DC/DC conversion of the BUCK-BOOST topologys of non-isolated.Now to meet energy storage, the energy makes full use of.Vehicle-mounted and,
Battery formation aspect, DC/DC two-way changings are in the urgent need to traditional non-isolation type DC/DC converters, due to not possessing electricity
Gas is isolated in secure context and there is hidden danger, therefore isolated form DC/DC reversible transducers turn into main study subject.
The most preferential with LLC topologys in DC/DC converters, LLC topologys have almost gamut interior energy to realize ZVS, and in f
＜ fr (resonant frequency) secondary rectifying tubes can realize ZCS, and its control mode is PFM, and frequency pattern is trembled as born, can improve electricity
The EMC on road.It is unidirectional diode rectification mode if Fig. 1 is conventional full bridge LLC DC/DC converters.
As shown in Fig. 2 being LLC DC/DC transducer synchronous rectifications.Traditional diode rectification, in low-voltage, high-current output
In the case of, the ratio that the conduction loss of diode is accounted for is big so that circuit efficiency is difficult to adjust, and the increase of loss brings radiating again
Difficulty increased radiating cost, it is necessary to increase corresponding cooling measure, and modularization volume is also difficult to do small, and reduces circuit
Reliability, while not realizing the function of DC/DC two-way changings.
DC/DC converters can then reduce the conduction loss that rectifying tube brings according to synchronous rectification, improve circuit effect
Rate, radiating cost reduction, circuit power density can also do height, while DC/DC two-way changing functions can also be realized.
LLC DC/DC transducer synchronous rectifications, it brings some problems such as in f ＜ fr, and P ＜ Po (rated power)
Under the conditions of, synchronous rectification can bring current flowing backwards problem.Current flowing backwards problem can cause occur when secondary pipe is turned off
Vds spikes stress and secondary turn-off power loss increase, while primary side is caused by body diode current feedback coupled to primary side, it is former
The Reverse recovery of side pipe body diode is likely to result in primary side pipe intercommunication instantaneous short circuit, and this is likely to result in primary side pipe damage
It is bad.This greatly reduces circuit reliability, and counnter attack irrigation technology must be realized.Fig. 2 is general LLC DC/DC synchronous rectifications letter structure
Figure.
Fig. 2, is LLC DC/DC transducer synchronous rectification block diagrams, contains and is adopted using synchronous rectification IC schemes and utilization
Collection secondary current, samples to electric current, detects current zero-crossing point to realize synchronous rectification.
Synchronous rectification is converted under low pressure state for traditional LLC DC/DC, mostly comes real using synchronous rectification IC technologies
Existing, its is simple and reliable.If both sides all have high-pressure situations in DC/DC conversion, traditional synchronous rectification IC technologies are
Be not suitable for being applied to above this, therefore by the way of electric current is detected, synchronize rectification control, using dsp software logic control,
Control is flexible.
Synchronous rectification is converted for two-way DC/DC, current over-zero detection is carried out using current sample, it is needed accordingly
Control signal carries out the differentiation of two-way operation, while needing to add corresponding logic control.
The content of the invention
It is an object of the invention to provide a kind of converter control circuit being self-regulated with bi-directional synchronization rectification and dead band,
To solve the problems, such as to be proposed in above-mentioned background technology.
To achieve the above object, the present invention provides following technical scheme：
A kind of converter control circuit being self-regulated with bi-directional synchronization rectification and dead band, including symmetrical Va sides electricity
Road and Vb lateral circuits, the Va lateral circuits include that metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4, Vb lateral circuit include MOS
Pipe Q5, metal-oxide-semiconductor Q6, metal-oxide-semiconductor Q7 and metal-oxide-semiconductor Q8, drain electrode, the electric capacity Ca and voltage Va of the drain electrode connection metal-oxide-semiconductor Q2 of metal-oxide-semiconductor Q1,
The drain electrode of the drain electrode connection electric capacity Cr and metal-oxide-semiconductor Q3 of metal-oxide-semiconductor Q1, the winding LM and MOS of the source electrode connection transformer T1 of metal-oxide-semiconductor Q2
The drain electrode of pipe Q4, the grid and drive signal Vg11/Vg110 of the grid connection metal-oxide-semiconductor Q4 of metal-oxide-semiconductor Q1, the grid of metal-oxide-semiconductor Q2 connects
The grid and drive signal Vg22/Vg220 of metal-oxide-semiconductor Q3 are connect, the drain electrode of the other end connection inductance Lr, metal-oxide-semiconductor Q1 of electric capacity Cr connects
Meet drain electrode, electric capacity Ca and the voltage Va of metal-oxide-semiconductor Q2, the drain electrode of the drain electrode connection electric capacity Cb and metal-oxide-semiconductor Q6 of metal-oxide-semiconductor Q5, metal-oxide-semiconductor Q6
Source electrode connection transformer T1, metal-oxide-semiconductor Q5 grid connection metal-oxide-semiconductor Q8 grid and drive signal Vg33/Vg331, metal-oxide-semiconductor Q6
Grid connection metal-oxide-semiconductor Q7 grid and drive signal Vg44/Vg441, the other end of the source electrode connection electric capacity Ca of metal-oxide-semiconductor Q3,
The source electrode and resistance R1 of metal-oxide-semiconductor Q4, the in-phase input end of the other end connection comparator U1D of resistance R1, comparator U1D's is anti-phase
Input is grounded by resistance R2, the output end connection diode D11 of comparator U1D, resistance R18 and resistance R4, resistance R18's
The emitter stage of other end connecting triode Q1 and the inverting input of comparator U4, the output end connection resistance R14 of comparator U4
And the Vs22 signals connection comparator U1 of negative electrode connection signal Vs11, the DSP output of DSP, diode D11 inverting input and
The negative electrode of diode D13, the output end connection and the one of door A3 of in-phase input end connection the resistance R6, comparator U1 of comparator U1
Individual input and an input with door A5, DSP is connected with another input of door A3, be connected with the output end of door A3 with
One input of door A4, the input and the base stage of triode Q1 with door A6 are connected with another input of door A4,
With the anode that the output end of door A4 is connected diode D66, the negative electrode of diode D66 connects drive signal Vg33, defeated with door A6
Go out the anode that end connects diode D122, the negative electrode connection drive signal Vg44 of diode D122, another input with door A6
End connection and the output end of door A5, DSP, the anode connection electric capacity C1 of diode D13, electricity are connected with another input of door A5
Hold C2, the negative electrode of resistance R5 and diode D12, the negative electrode and the moon of diode D19 of the other end connection diode D18 of electric capacity C1
Pole, the anode and DSP of the anode connection diode D118 of diode D18, the negative electrode connection drive signal of diode D118
Vg110。
As further scheme of the invention：The triode Q1 is p-type triode.
Compared with prior art, the beneficial effects of the invention are as follows：
1st, the present invention is carried out under two-way changing in two-way DC/DC conversion using LLC topologys, can be in the case of two-way changing
Current zero-crossing point can be judged, increase filters first erroneous judgement of zero crossing, while using PWM controls, improving rectification secondary
Side in the switching characteristic in perceptual region capacitive area rectifying tube and, MOS body diode reverses recover the influence for causing, with biography
The synchronous rectification IC of system for controlling, is more suitably applied to high-low pressure occasion, and its range of application is wider.Realizing two-way DC/
While DC counnter attacks are filled, its current detecting can be utilized to realize the regulation of Dead Time again, this may be real under solving LLC maximum conditions
Now not ZVS Sofe Switch problems, improve circuit efficiency, improve circuit EMC, and circuit reliability is also substantially increased.
2nd, realize that synchronous rectification is counter and fill problem for again by detection electric current, and increased PWM blanking circuits and filter the
The erroneous judgement that one zero point is brought, while a bit of time t that staggers on a kind of former secondary driving time of invention, for preventing during blanking
The interior current flowing backwards for bringing.It can accomplish preferably to protect pipe without damage on current detecting counnter attack irrigation technology, significantly
Improve the reliability of circuit.
Brief description of the drawings
Fig. 1 is the circuit diagram of prior art 1.
Fig. 2 is the circuit diagram of prior art 2.
Fig. 3 is circuit diagram of the invention.
Fig. 4 is the DSP oscillograms of Va-Vb mode of operations of the present invention.
Fig. 5 is the DSP oscillograms of Vb-Va mode of operations of the present invention.
Fig. 6 is the circuit diagram of an embodiment of the present invention.
Fig. 7 is the DSP oscillograms of embodiment of the present invention Va-Vb mode of operations.
Fig. 8 is the DSP oscillograms of embodiment of the present invention Vb-Va mode of operations.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Fig. 1~8 are referred to, in the embodiment of the present invention, the present invention proposes a kind of with bi-directional synchronization rectification and dead band self-regulated
The converter control circuit of section, including symmetrical Va lateral circuits and Vb lateral circuits, the Va lateral circuits include metal-oxide-semiconductor Q1,
Metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4, Vb lateral circuit include metal-oxide-semiconductor Q5, metal-oxide-semiconductor Q6, metal-oxide-semiconductor Q7 and metal-oxide-semiconductor Q8, metal-oxide-semiconductor Q1
Drain electrode connection metal-oxide-semiconductor Q2 drain electrode, electric capacity Ca and voltage Va, the leakage of the drain electrode connection electric capacity Cr and metal-oxide-semiconductor Q3 of metal-oxide-semiconductor Q1
Pole, the drain electrode of the winding LM and metal-oxide-semiconductor Q4 of the source electrode connection transformer T1 of metal-oxide-semiconductor Q2, the grid connection metal-oxide-semiconductor Q4 of metal-oxide-semiconductor Q1
Grid and drive signal Vg11/Vg110, the grid and drive signal Vg22/ of the grid connection metal-oxide-semiconductor Q3 of metal-oxide-semiconductor Q2
Drain electrode, the electric capacity Ca and voltage Va of the drain electrode connection metal-oxide-semiconductor Q2 of the other end connection inductance Lr, metal-oxide-semiconductor Q1 of Vg220, electric capacity Cr,
The drain electrode of the drain electrode connection electric capacity Cb and metal-oxide-semiconductor Q6 of metal-oxide-semiconductor Q5, the source electrode connection transformer T1 of metal-oxide-semiconductor Q6, the grid of metal-oxide-semiconductor Q5
Pole connects the grid and drive signal Vg33/Vg331 of metal-oxide-semiconductor Q8, the grid of the grid connection metal-oxide-semiconductor Q7 of metal-oxide-semiconductor Q6 and driving
The source electrode of signal Vg44/Vg441, metal-oxide-semiconductor Q3 connects the other end, the source electrode of metal-oxide-semiconductor Q4 and the resistance R1 of electric capacity Ca, resistance R1's
The in-phase input end of other end connection comparator U1D, the inverting input of comparator U1D is grounded by resistance R2, comparator U1D
Output end connection diode D11, resistance R18 and resistance R4, the emitter stage and ratio of the other end connecting triode Q1 of resistance R18
Compared with the inverting input of device U4, output end connection the resistance R14 and DSP of comparator U4, the negative electrode connection signal of diode D11
The inverting input and the negative electrode of diode D13 of the Vs22 signals connection comparator U1 of Vs11, DSP output, comparator U1's is same
Phase input connects resistance R6, and the output end connection of comparator U1 is input into an input of door A3 and with one of door A5
End, DSP is connected with another input of door A3, an input with door A4 is connected with the output end of door A3, with door A4's
Another input connects the input and the base stage of triode Q1 with door A6, and the output end with door A4 is connected diode
The anode of D66, the negative electrode connection drive signal Vg33 of diode D66, and the anode that the output end of door A6 is connected diode D122,
The negative electrode connection drive signal Vg44 of diode D122, the output end with door A5 is connected with another input of door A6, with door
The anode connection electric capacity C1 of the connection of another input DSP, diode D13 of A5, electric capacity C2, resistance R5 and diode D12
Negative electrode, the negative electrode and the negative electrode of diode D19 of the other end connection diode D18 of electric capacity C1, the anode connection two of diode D18
The anode and DSP of pole pipe D118, the negative electrode connection drive signal Vg110 of diode D118.
Triode Q1 is p-type triode.
Operation principle of the invention is：Due to being DC/DC reversible transducers, so for two-way, setting a flag bit
Signal Fg, different to flag signal Fg amplitudes by the different mode of operations that work, by taking low and high level as an example, 1 represents high
Level, 0 represents low level.
When being operated in Va → Vb such as circuit, Fg=1；When being operated in Vb → Va, Fg=0；Primary side drives to be driven with secondary
In the same time and driving time length is the same.For LLC, due to secondary current waveform near sinusoidal, therefore its current wave
There are 2 zero crossings in shape, elimination of hidden, maskable first zero point are carried out to the current waveform of secondary sampler using primary side PWM
The erroneous judgement for bringing.DSP has 8 PWM to drive mouth, is respectively applied among two-way changing.
1:It is operated under the conditions of Va → Vb, DSP judges, provides Fg=1.Drive waveforms that its DSP sends as shown in figure 3,
A2, A8 are output as low level with door, and Q1 and Q4 drivings directly connect Vg110, Q2 and Q3 driving and directly meet Vg220.The driving of Q5, Q8
Connection Vg33, the drive connection Vg44 of Q6, Q7.Vb sides are entered by Vb sides precision sampling resistor Rs2 as secondary to secondary current
Row sampling, because current waveform is sine wave on Rs2, in first zero point, Vg1 and Vg2 charges to electric capacity so that Vs22>
(Vref-VF), comparator U1 is output as high level, and Fg=1, Vg33 and Vg44 follow Vg333 and Vg444 respectively.
When at a time, when Rs2 up-sampling voltages in Vb sides are zero, Vs22 ＜ (Vref-VF), U1 comparators export low electricity
Flat, Vg33 and Vg44 drives shut-off, and so when electric current starts anti-filling, current over-zero detection directly turns off Vb side synchronizations
Rectification drive signal, realizes counnter attack and fills function,
In Va sides Rs1 resistance samplings, at a time, Q1, Q4 shut-off, primary current by Q2, Q3 body diode afterflows,
At the afterflow moment, the upper voltage sampling signals of Rs1 become negative value；When the voltage of Rs1 samplings is less than Vth1, U4 comparators are defeated
Go out low level, be sent to DSP, DSP detects low level, then send Q2 at once, Q3 drives, the value that Vth1 is set can be protected
Card pipe has transferred the Coss junction capacity of itself.So determine dead band time setting for traditional, efficiency can be improved, realize
ZVS in LLC gamuts.Realize under Va → Vb working conditions, the dead band regulation of Va sides, the synchronous rectification counnter attack of Vb sides fills control
System.
2：It is operated under the conditions of Vb → Va, DSP judges, provides Fg=0.It is as shown in Figure 4 that its DSP sends drive waveforms：A4,
A6 is output as low level with door, and Q5 and Q8 drivings directly connect Vg331, Q6 and Q7 driving and directly meet Vg441.The driving of Q1, Q4 connects
Vg11 is met, the drive connection Vg22.Va sides of Q2, Q3 are carried out by Va sides precision sampling resistor Rs1 as secondary to secondary current
Sampling, because current waveform is sine wave on Rs1, in first zero point, Vg3 and Vg4 charges to electric capacity so that Vs11>
(Vref-VF), comparator U2 is output as high level, and Fg=1, Vg11 and Vg22 follow Vg111 and Vg222 respectively.
When at a time, when Rs1 up-sampling voltages in Va sides are zero, Vs11 ＜ (Vref-VF), U2 comparators export low electricity
Flat, Vg11 or Vg22 drives shut-off, and so when electric current starts anti-filling, current over-zero detection directly turns off Va side synchronizations
Rectification drive signal, realizes counnter attack and fills function.
In Vb sides Rs1 resistance samplings, at a time, Q5, Q8 shut-off, primary current by Q6, Q7 body diode afterflows,
At the afterflow moment, the upper voltage sampling signals of Rs2 become negative value；When the voltage of Rs2 samplings is less than Vth1, U3 comparators are defeated
Go out low level, be sent to DSP, DSP detects low level, then send Q6 at once, Q7 drives, the value that Vth1 is set can be protected
Card pipe has transferred the Coss junction capacity of itself.So determine dead band time setting for traditional, efficiency can be improved, realize
ZVS in LLC gamuts.Realize under Vb → Va working conditions, the dead band regulation of Vb sides, the synchronous rectification counnter attack of Va sides fills control
System.
As a kind of embodiment of the invention：As shown in Figure 6：In PWM blankings, first erroneous judgement of zero point of electric current is filtered,
But electric current is also likely to be present simultaneously to pour in down a chimney, if within the blanking time, there is the anti-filling of electric current, can equally cause pipe Vds spikes
Stress, and increase turn-on consumption, while start between normal output period, there is uncontrollable situation in DC/DC converters,
And in the case where switching frequency f is limited, there is a voltage in output, and main circuit cannot adjust output and reach that voltage
When, i.e., current flowing backwards that may be present under overvoltage condition.
It is limited for the current flowing backwards that may be present in the blanking time, and overpressure switch frequency f, and during delay startup
The situation of interior bad control, increases some control units.
The present embodiment is the drive scheme for filtering blanking circuit：It is to playing what controllable firmly electric current was present in the blanking time
Anti- to fill problem, while also functioning under case of heavy load, electric current is asked by pipe body diode, the reverse recovery time of body diode
Topic, it is possible to cause not terminate still after another group is driven into, so as to cause intercommunication phenomenon, this may damage pipe
Son, by using diode rectification, postpones a bit of time, it is to avoid diode reverse recovery and metal-oxide-semiconductor open cause mutual
It is logical, the generation of this case can be avoided.
As shown in Figure 6：The driving time of former secondary is staggered minor time slice t in dsp, t accounts for ON time very little,
Within the PWM blanking times, secondary drives not open, and makes it into diode rectification.This can prevent electric current in the PWM blanking times
It is anti-to fill, also function to the intercommunication phenomenon for preventing reverse recovery time of diode from causing.But also bring that diode rectification brings is more
Remaining loss, while also prevent when shut-off is driven, due to circuit time delay in itself, the anti-filling problem being likely to result in, diode
Also reverse recovery loss is brought, this can be by looking for body diode reverse recovery time short.Secondary is driven when staggering one section
Between, this can save PWM blanking circuits, alleviate the complexity of circuit, increased reliability.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be in other specific forms realized.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit requires to be limited rather than described above, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.Any reference in claim should not be considered as the claim involved by limitation.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each implementation method is only wrapped
Containing an independent technical scheme, this narrating mode of specification is only that for clarity, those skilled in the art should
Specification an as entirety, the technical scheme in each embodiment can also be formed into those skilled in the art through appropriately combined
May be appreciated other embodiment.
Claims (2)
1. a kind of converter control circuit being self-regulated with bi-directional synchronization rectification and dead band, including symmetrical Va lateral circuits
With Vb lateral circuits, it is characterised in that the Va lateral circuits include metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4, Vb sides electricity
Road includes metal-oxide-semiconductor Q5, metal-oxide-semiconductor Q6, metal-oxide-semiconductor Q7 and metal-oxide-semiconductor Q8, drain electrode, the electric capacity Ca of the drain electrode connection metal-oxide-semiconductor Q2 of metal-oxide-semiconductor Q1
With voltage Va, the drain electrode of the drain electrode connection electric capacity Cr and metal-oxide-semiconductor Q3 of metal-oxide-semiconductor Q1, the source electrode connection transformer T1 of metal-oxide-semiconductor Q2 around
The drain electrode of group LM and metal-oxide-semiconductor Q4, the grid and drive signal Vg11/Vg110 of the grid connection metal-oxide-semiconductor Q4 of metal-oxide-semiconductor Q1, metal-oxide-semiconductor
The grid and drive signal Vg22/Vg220 of the grid connection metal-oxide-semiconductor Q3 of Q2, the other end connection inductance Lr of electric capacity Cr, metal-oxide-semiconductor
The leakage of the drain electrode connection electric capacity Cb and metal-oxide-semiconductor Q6 of drain electrode, the electric capacity Ca and voltage Va of the drain electrode connection metal-oxide-semiconductor Q2 of Q1, metal-oxide-semiconductor Q5
Pole, the grid and drive signal Vg33/ of the grid connection metal-oxide-semiconductor Q8 of source electrode connection the transformer T1, metal-oxide-semiconductor Q5 of metal-oxide-semiconductor Q6
The grid and drive signal Vg44/Vg441 of the grid connection metal-oxide-semiconductor Q7 of Vg331, metal-oxide-semiconductor Q6, the source electrode connection electricity of metal-oxide-semiconductor Q3
Hold the in-phase input end of the other end connection comparator U1D of the other end, the source electrode of metal-oxide-semiconductor Q4 and resistance R1, resistance R1 of Ca, than
Inverting input compared with device U1D is grounded by resistance R2, output end connection diode D11, the resistance R18 and electricity of comparator U1D
Resistance R4, the emitter stage and the inverting input of comparator U4 of the other end connecting triode Q1 of resistance R18, the output of comparator U4
End connection resistance R14 and DSP, the Vs22 signals of negative electrode connection signal Vs11, the DSP output of diode D11 connect comparator U1
Inverting input and diode D13 negative electrode, comparator U1 in-phase input end connection resistance R6, the output end of comparator U1
Connection and an input and an input with door A5 of door A3, are connected DSP, with door A3 with another input of door A3
Output end connection and the input of door A4, be connected with another input of door A4 and door A6 an input and three
The base stage of pole pipe Q1, with the anode that the output end of door A4 is connected diode D66, the negative electrode connection drive signal of diode D66
Vg33, with the anode that the output end of door A6 is connected diode D122, the negative electrode connection drive signal Vg44 of diode D122, with door
The connection of another input and the output end of door A5 of A6, DSP, the sun of diode D13 are connected with another input of door A5
Pole connects electric capacity C1, electric capacity C2, the negative electrode of resistance R5 and diode D12, the negative electrode of the other end connection diode D18 of electric capacity C1
With the negative electrode of diode D19, the anode and DSP of the anode connection diode D118 of diode D18, the negative electrode company of diode D118
Meet drive signal Vg110.
2. the converter control circuit being self-regulated with bi-directional synchronization rectification and dead band according to claim 1, its feature
It is that the triode Q1 is p-type triode.
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