CN104980037B - A kind of secondary adjusting type determines frequency controlled resonant converter and its control method - Google Patents
A kind of secondary adjusting type determines frequency controlled resonant converter and its control method Download PDFInfo
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Abstract
Determine frequency controlled resonant converter and its control method the invention discloses a kind of secondary adjusting type, the converter is made up of input source, primary side switch circuit, resonator, secondary-side switch circuit, transformer, the first output filter capacitor, the second output filter capacitor and load, wherein primary side switch circuit is made up of four switching tubes, resonator is made up of the first resonant inductance, the second resonant inductance and resonant capacitance, and secondary-side switch circuit is made up of four diodes and two switching tubes.The converter realizes the control of output voltage by the phase shifting control of primary side switch circuit and secondary-side switch circuit.Secondary adjusting type of the present invention, which determines frequency controlled resonant converter, can effectively reduce the circulation loss in the case of wide input voltage, the Sofe Switch of all switching tubes is realized in full-load range, secondary-side switch device voltage stress is only the half of output voltage, and key technology is provided for width input, efficient, high-power isolation power conversion occasion.
Description
Technical field
Determine frequency controlled resonant converter and its control method the present invention relates to a kind of secondary adjusting type, belong to converters
Technical field.
Background technology
DC converter has become the important device in all kinds of electrical systems, in fields such as national economy, society, national defence
Play a significant role.With the development of the technologies such as Aeronautics and Astronautics, renewable energy power generation, energy storage, the effect of DC converter is improved
Rate, power density and to extend DC converter be in face of conciliating to the adaptability of input and output voltage required for DC converter
Major issue certainly.
Flyback, normal shock, recommend, traditional PWM DC converters such as full-bridge because its switching tube works in hard switching state,
Switching loss is big, efficiency is low, is not suitable for working in high frequency state, it is also difficult to realize that high efficiency is converted.By introducing Sofe Switch skill
Art can effectively reduce the switching loss of PWM DC converters so that its can operate at higher switching frequency, realize it is higher
Power density, but its cost is being significantly increased for conduction loss, particularly when input or the change of output voltage wide scope, is
Realize that Sofe Switch needs the cost paid higher.By taking full-bridge converter as an example, by using Phase Shift Control Study and electricity is aided in
Sense, it is possible to achieve the Sofe Switch of switching tube, but when input voltage rise or output voltage reduction cause effective duty cycle
During reduction, circulation loss is significantly increased caused by auxiliary induction, so as to cause the reduction of efficiency.
LLC resonant converter be obtain in recent years extensive concern and gradually obtain industrial quarters accreditation DC converter open up
Flutter.It can realize the Sofe Switch of all switching tubes, diode, be particularly suitable for high-frequency work, by means of integrated magnetic, can
Realize very high power density.However, LLC resonant converter needs to adjust output voltage by the way of switching frequency is changed
And power output, this causes the magnetic elements of LLC resonant converter to be difficult to optimize design.More seriously, in order to suitable
Width funtion, loading range regulation are answered, the magnetizing inductance of LLC resonant converter has to reduce to provide required voltage gain,
This causes circulation loss to be significantly increased, whole efficiency (particularly light-load efficiency) serious reduction.Current domestic and foreign scholars and industry
Shortcoming of the boundary for frequency conversion LLC proposes a variety of improved methods, including parameter optimization, improvement control mode, improvement topological structure
Deng, but all produce little effect.Document " Zhiyuan Hu, Yajie Qiu, Laili Wang, Yan-Fei Liu, ' An
interleaved LLC resonant converter operating at constant switching
frequency,'IEEE Trans.Power Electronics,vol.29,no.6,pp.2931-2943,June 2014.”
Propose it is a kind of determine frequency LLC resonant converter topological structure, it by circuit primary side dynamically adjust resonant capacitance capacitance come
Adjust output voltage, although realize fixed-frequency control, but control is complicated, and the conduction loss additionally introduced is very big.
The content of the invention
Goal of the invention：For above-mentioned prior art, propose that a kind of secondary adjusting type determines frequency controlled resonant converter and its controlling party
Method, effectively reduces circulation loss, improves transducer effciency.
Technical scheme：A kind of secondary adjusting type determines frequency controlled resonant converter, including input source, primary side switch circuit, resonator,
Transformer, secondary-side switch circuit, the first output filter capacitor, the second output filter capacitor and load；The primary side switch electricity
Road includes first switch pipe, second switch pipe, the 3rd switching tube and the 4th switching tube, and the resonator includes the first resonance electricity
Sense, the second resonant inductance, resonant capacitance, the secondary-side switch circuit include the first diode, the second diode, the three or two pole
Pipe, the 4th diode, the 5th switching tube and the 6th switching tube, the transformer include primary side winding and vice-side winding；
The positive pole of the input source is connected with the drain electrode of first switch pipe and the drain electrode of second switch pipe respectively, first switch
The source electrode of pipe is respectively connected to drain electrode and one end of the first resonant inductance of the 3rd switching tube, and the other end of the first resonant inductance is connected in
One end of second resonant inductance and the Same Name of Ends of transformer primary side winding, it is humorous that the non-same polarity of transformer primary side winding is connected in second
Shake the other end of inductance and one end of series resonant capacitance, and the other end of series resonant capacitance is connected to the source electrode of second switch pipe
With the drain electrode of the 4th switching tube, the source electrode of the 4th switching tube is connected in the source electrode of the 3rd switching tube and the negative pole of input source；
The Same Name of Ends of the transformer secondary winding is connected in the anode of the first diode, the negative electrode of the 3rd diode, first
The negative electrode of diode is connected to one end of the negative electrode of the second diode, one end of the first output filter capacitor and load, load
The other end is connected in the anode of one end of the second output filter capacitor, the anode of the 3rd diode and the 4th diode, the first output
The other end of filter capacitor is connected in the other end of the second output filter capacitor, the drain electrode of the 5th switching tube, the source of the 5th switching tube
Pole is connected in the source electrode of the 6th switching tube, the drain electrode of the 6th switching tube be connected in the anode of the second diode, the 4th switch tube cathode and
The non-same polarity of transformer secondary winding.
A kind of secondary adjusting type determines the control method of frequency controlled resonant converter, and the switching tubes of first switch Guan Yu tri- are complementary
Conducting, the complementation conducting of the switching tubes of second switch Guan Yu tetra-, the 5th switching tube and the complementation conducting of the 6th switching tube, first switch
The dutycycle of pipe, second switch pipe, the 3rd switching tube, the 4th switching tube, the 5th switching tube and the 6th switching tube is equal, and first opens
Close pipe and the 4th switching tube is simultaneously turned on, simultaneously turned off, second switch pipe and the 3rd switching tube are simultaneously turned on, simultaneously turned off, the
Opening for one switching tube is not later than opening the moment for the 6th switching tube constantly, and the opening of second switch pipe is not later than the 5th and opened constantly
Close pipe opens the moment, and output voltage is realized by adjusting the phase shifting angle between first switch pipe and the 6th switching tube turn-on instant
Control.
Beneficial effect：(1) converter of the invention determines frequency switch, and pressure regulation is realized by former secondary phase shifting control, can
Circulation loss is effectively reduced, transducer effciency is improved, it is adaptable to wide input voltage occasion.
(2) voltage of all switching devices is all directly by the half of input voltage, either output voltage or output voltage
Clamper, switching device voltage stress is low, further reduces circulation loss；
(3) all switching devices can realize Sofe Switch in full-load range, and conversion efficiency is high；
(4) the first resonant inductance (L of series connectionr) completely or partially replaced by the leakage inductance of transformer (T), in parallel second is humorous
Shake inductance (Lm) all or part of magnetizing inductance replacement by transformer (T), transformer leakage inductance and magnetizing inductance obtain effective profit
With；
(5) converter can be worked with HF switch, so as to effectively reduce the volume weight of inductance and transformer, be realized high
Power density.
Brief description of the drawings
Accompanying drawing 1 is the circuit theory diagrams that secondary adjusting type of the present invention determines frequency controlled resonant converter；
Accompanying drawing 2 is the main oscillogram that secondary adjusting type of the present invention determines frequency controlled resonant converter；
3~accompanying drawing of accompanying drawing 8 is that secondary adjusting type of the present invention determines the equivalent circuit diagram that frequency controlled resonant converter respectively switchs mode；
Designation in the figures above：VinFor input source voltage；10 be primary side switch circuit；20 be resonator；30 are
Secondary-side switch circuit；T is transformer；NPAnd NSRespectively transformer T primary side winding and vice-side winding；Cf1、Cf2Respectively
First, the second output filter capacitor；RLdFor load；Q1、Q2、Q3、Q4、Q5And Q6Respectively first, second, third, fourth, the 5th and
6th switching tube；DR1、DR2、DR3And DR4Respectively first, second, third and fourth diode；VoFor output voltage；vABFor A, B
Voltage (first switch pipe Q between 2 points1Source electrode and the 3rd switching tube Q3The tie point of drain electrode is designated as A points, second switch pipe Q2
Source electrode and the 4th switching tube Q4Drain junction is designated as B points)；vsecFor transformer T vice-side windings NSSame Name of Ends and non-same polarity it
Between voltage；iLrFor the first resonance electricity LrElectric current；iLmFor the second resonant inductance LmElectric current；iD1For the first diode DR1's
Electric current；iD2For the second diode DR2Electric current；iQ5For the 5th switching tube Q5Electric current；vdsQ5For the 5th switching tube Q5Drain electrode and source
Voltage between pole；iQ6For the 6th switching tube Q6Electric current；vdsQ6For the 6th switching tube Q6Voltage between drain electrode and source electrode；t、
t0、t1、t2、t3、t4And t5For the time.
Embodiment
The present invention is done below in conjunction with the accompanying drawings and further explained.
As shown in Figure 1, a kind of secondary adjusting type determines frequency controlled resonant converter, including input source Vin, primary side switch circuit 10,
Resonator 20, transformer T, secondary-side switch circuit 30, the first output filter capacitor Cf1, the second output filter capacitor Cf2And it is negative
Carry RLd.Primary side switch circuit 10 includes first switch pipe Q1, second switch pipe Q2, the 3rd switching tube Q3With the 4th switching tube Q4.It is humorous
The chamber 20 that shakes includes the first resonant inductance Lr, the second resonant inductance Lm, resonant capacitance Cr.Secondary-side switch circuit 30 includes the one or two pole
Pipe DR1, the second diode DR2, the 3rd diode DR3, the 4th diode DR4, the 5th switching tube Q5With the 6th switching tube Q6.Transformation
Device T includes primary side winding NPWith vice-side winding NS。
Input source VinPositive pole respectively with first switch pipe Q1Drain electrode and second switch pipe Q2Drain electrode be connected, first opens
Close pipe Q1Source electrode be respectively connected to the 3rd switching tube Q3Drain electrode and the first resonant inductance LrOne end, the first resonant inductance Lr's
The other end is connected in the second resonant inductance LmOne end and transformer T primary side windings NPSame Name of Ends, transformer T primary side windings NP's
Non-same polarity is connected in the second resonant inductance LmThe other end and series resonant capacitance CrOne end, series resonant capacitance CrIt is another
End is connected to second switch pipe Q2Source electrode and the 4th switching tube Q4Drain electrode, the 4th switching tube Q4Source electrode be connected in the 3rd switch
Pipe Q3Source electrode and input source VinNegative pole.
Transformer T vice-side windings NSSame Name of Ends be connected in the first diode DR1Anode, the 3rd diode DR3Negative electrode,
One diode DR1Negative electrode be connected to the second diode DR2Negative electrode, the first output filter capacitor Cf1One end and load RLd's
One end, loads RLdThe other end be connected in the second output filter capacitor Cf2One end, the 3rd diode DR3Anode and the four or two pole
Pipe DR4Anode, the first output filter capacitor Cf1The other end be connected in the second output filter capacitor Cf2The other end, the 5th switch
Pipe Q5Drain electrode, the 5th switching tube Q5Source electrode be connected in the 6th switching tube Q6Source electrode, the 6th switching tube Q6Drain electrode be connected in second
Diode DR2Anode, the 4th switching tube Q4Negative electrode and transformer T vice-side windings NSNon-same polarity.
Wherein, first switch pipe Q1With the 3rd switching tube Q3Complementation conducting, second switch pipe Q2With the 4th switching tube Q4It is complementary
Conducting, the 5th switching tube Q5With the 6th switching tube Q6Complementation conducting, first switch pipe Q1, second switch pipe Q2, the 3rd switching tube Q3、
4th switching tube Q4, the 5th switching tube Q5With the 6th switching tube Q6Dutycycle it is equal, first switch pipe Q1With the 4th switching tube Q4
Simultaneously turn on, simultaneously turn off, second switch pipe Q2With the 3rd switching tube Q3Simultaneously turn on, simultaneously turn off, first switch pipe Q1Open
The logical moment is not later than the 6th switching tube Q6Open the moment, second switch pipe Q2Open and be not later than the 5th switching tube Q constantly5's
The moment is opened, by adjusting first switch pipe Q1With the 6th switching tube Q6Phase shifting angle between turn-on instant realizes output voltage
Control.
In the specific implementation, the first resonant inductance L of series connectionrAll or part of leakage inductance by transformer T is replaced, in parallel
Second resonant inductance LmAll or part of magnetizing inductance by transformer T is replaced, and this causes transformer leakage inductance and magnetizing inductance to obtain
To effective utilization.
The secondary adjusting type of the present invention determines frequency controlled resonant converter in the specific implementation, and all switching tubes, which should be selected to carry, to be posted
The semiconductor switch device of raw body diode, such as mos field effect transistor.If selected opens
Pipe is closed without parasitic body diode, then should be in its drain electrode and source electrode two ends anti-paralleled diode.
The secondary adjusting type of the present invention determines frequency controlled resonant converter in the specific implementation, two in same bridge arm switching tube
Between should add dead time, the addition of dead time leads directly to phenomenon partly in order to avoiding the occurrence of bridgc arm short, another
Aspect is to realize the Sofe Switch of switching tube.
Determine frequency controlled resonant converter structure from the secondary adjusting type shown in accompanying drawing 1 can intuitively find out, the converter primary side
Switching device be all input directly into voltage clamping, i.e., its voltage stress is equal to input voltage, and the diode of secondary is all direct
The half clamper of voltage or output voltage is output, its voltage stress is equal to the half of output voltage or output voltage, and converts
The switching tube of device secondary is all directly by two output filter capacitor voltage clampings, and its voltage stress is only equal to the one of output voltage
Half, due to voltage spikes problem is all not present in all switching devices of primary and secondary side, and the voltage stress of switching device is low, therefore its ring
Stream loss is small.
Assuming that all inductance, electric capacity, switching tube and diode are all ideal component, ignore output filter capacitor Cf1And Cf2
On voltage ripple, and electric capacity Cf1And Cf2On voltage it is equal, then electric capacity Cf1And Cf2Voltage be respectively equal to output voltage Vo's
Half.The operation principle of analytic transformation device separately below.
Accompanying drawing 2 is the key operation waveforms of converter.In this mode, six kinds of switching moldings are had in half of switch periods
State.
t0Before moment, switching tube Q2And Q3Conducting, Lr、CrAnd LmIt is common to participate in resonance, electric current iLrWith electric current iLmIt is equal,
The equal no current of transformer primary secondary, load is powered by output filter capacitor.
Switch [the t of mode 10, t1], corresponding diagram 3：t0Moment, on-off switching tube Q2And Q3, due to inductance LmThe larger and mode
Duration is very short, and it is constant to be approximately considered resonant inductance electric current, iLr=iLm, iLrTo C2And C3Charging, while to C1And C4
Electric discharge.Due to C1~C4Limit switching tube Q2And Q3The voltage build-up rate at two ends, therefore Q2And Q3It is approximately zero voltage turn-off.
t1Moment, vABBy-VinWhile rising to zero, secondary voltage VsecAlso zero is risen to, into next switch mode.
Switch [the t of mode 21, t2], corresponding diagram 4：t1Moment, secondary voltage VsecBecome just by zero, switching tube Q5No-voltage is opened
It is logical, with switching tube Q6, transformer secondary winding NS、VDR1、Cf1Constitute loop switch tube Q6Electric discharge.
Switch [the t of mode 32, t3], corresponding diagram 5：t2Moment, switching tube Q6Voltage drops to zero, the conducting of its body diode, becomes
Depressor secondary voltage is output voltage half Vo/ 2, original edge voltage is to be clamped at nVo/2.Mid-point voltage VABRise to Vin, open
Close pipe Q1And Q4Body diode conducting, therefore switching tube Q1And Q4It is that no-voltage is open-minded.Switching tube Q6Body diode and secondary
Commutation diode DR1, switching tube Q5And vice-side winding NSLoop is constituted, by inductance LmVoltage clamp in nVo/ 2, now inductance Lm
It is not involved in resonance, electric current iLmIt is linearly increasing, LrAnd CrSeries resonance works.
Switch [the t of mode 43, t4], corresponding diagram 6：t3Moment, switching tube Q5Shut-off, due to C5Limit switching tube Q5Two ends
Voltage build-up rate, therefore Q5For zero voltage turn-off.In t4Moment, Q5The voltage at two ends rises to Vo/ 2, the mode terminates.
Switch [the t of mode 54, t5], corresponding diagram 7：t4Moment, commutation diode DR4Conducting, secondary current is through DR1And DR4To negative
Carry transmission energy.Inductance LmVoltage be clamped at nVo, inductance LmIt is not involved in resonance, electric current iLmIt is linearly increasing.LrAnd CrContinue
Series resonance works.
Switch [the t of mode 65, t6], corresponding diagram 8：In t5Moment, electric current iLrResonance to electric current iLmIt is equal, now converter
Primary and secondary side is disengaged, commutation diode DR1With DR4Turned off for ZCS, in the absence of reverse-recovery problems.Inductance LmThe voltage at two ends
No longer it is clamped at nVo, with Lr、CrResonant operational together.
t6At the moment, turn off Q1And Q4, into lower half of work period, the operation principle of converter and upper half period
Working condition is similar, will not be described in great detail here.
Frequency controlled resonant converter and its control method are determined according to the secondary adjusting type of the present invention, pass through primary side switch circuit and pair
The phase shifting control of side on-off circuit realizes the control of output voltage, and primary side switch pipe is adjusted relative to existing full-bridge LLC resonators
For, the circulation loss in the case of wide input voltage can be effectively reduced by the modulation to secondary-side switch pipe, in full-load range
The Sofe Switch of all switching tubes is inside realized, secondary-side switch device voltage stress is only the half of output voltage, be wide input, height
Effect, high-power isolation power conversion occasion provide key technology.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (2)
1. a kind of secondary adjusting type determines frequency controlled resonant converter, it is characterised in that：Including input source (Vin), primary side switch circuit
(10), resonator (20), transformer (T), secondary-side switch circuit (30), the first output filter capacitor (Cf1), second output filtering
Electric capacity (Cf2) and load (RLd)；The primary side switch circuit (10) includes first switch pipe (Q1), second switch pipe (Q2),
Three switching tube (Q3) and the 4th switching tube (Q4), the resonator (20) includes the first resonant inductance (Lr), the second resonant inductance
(Lm), resonant capacitance (Cr), the secondary-side switch circuit (30) includes the first diode (DR1), the second diode (DR2), the 3rd
Diode (DR3), the 4th diode (DR4), the 5th switching tube (Q5) and the 6th switching tube (Q6), the transformer (T) includes original
Side winding (NP) and vice-side winding (NS)；
Input source (the Vin) positive pole respectively with first switch pipe (Q1) drain electrode and second switch pipe (Q2) drain electrode be connected,
First switch pipe (Q1) source electrode be respectively connected to the 3rd switching tube (Q3) drain electrode and the first resonant inductance (Lr) one end, first
Resonant inductance (Lr) the other end be connected in the second resonant inductance (Lm) one end and transformer (T) primary side winding (NP) Same Name of Ends,
Transformer (T) primary side winding (NP) non-same polarity be connected in the second resonant inductance (Lm) the other end and series resonant capacitance (Cr)
One end, series resonant capacitance (Cr) the other end be connected to second switch pipe (Q2) source electrode and the 4th switching tube (Q4) leakage
Pole, the 4th switching tube (Q4) source electrode be connected in the 3rd switching tube (Q3) source electrode and input source (Vin) negative pole；
Transformer (T) vice-side winding (NS) Same Name of Ends be connected in the first diode (DR1) anode, the 3rd diode (DR3)
Negative electrode, the first diode (DR1) negative electrode be connected to the second diode (DR2) negative electrode, the first output filter capacitor (Cf1)
One end and load (RLd) one end, load (RLd) the other end be connected in the second output filter capacitor (Cf2) one end, the three or two pole
Manage (DR3) anode and the 4th diode (DR4) anode, the first output filter capacitor (Cf1) the other end be connected in the second output
Filter capacitor (Cf2) the other end, the 5th switching tube (Q5) drain electrode, the 5th switching tube (Q5) source electrode be connected in the 6th switching tube
(Q6) source electrode, the 6th switching tube (Q6) drain electrode be connected in the second diode (DR2) anode, the 4th switching tube (Q4) negative electrode and change
Depressor (T) vice-side winding (NS) non-same polarity.
2. a kind of secondary adjusting type based on described in claim 1 determines the control method of frequency controlled resonant converter, it is characterised in that：Institute
State first switch pipe (Q1) and the 3rd switching tube (Q3) complementary conducting, second switch pipe (Q2) and the 4th switching tube (Q4) complementation leads
It is logical, the 5th switching tube (Q5) and the 6th switching tube (Q6) complementary conducting, first switch pipe (Q1), second switch pipe (Q2), the 3rd open
Close pipe (Q3), the 4th switching tube (Q4), the 5th switching tube (Q5) and the 6th switching tube (Q6) dutycycle it is equal, first switch pipe
(Q1) and the 4th switching tube (Q4) simultaneously turn on, simultaneously turn off, second switch pipe (Q2) and the 3rd switching tube (Q3) simultaneously turn on,
Simultaneously turn off, first switch pipe (Q1) open and be not later than the 6th switching tube (Q constantly6) open the moment, second switch pipe (Q2)
Open and be not later than the 5th switching tube (Q constantly5) open the moment, by adjusting first switch pipe (Q1) and the 6th switching tube
(Q6) phase shifting angle between turn-on instant realizes the control of output voltage.
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| CN104980037A (en) | 2015-10-14 |
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