CN102237799A - Three-level resonant converter clamped by resonant capacitor and transformer primary side - Google Patents
Three-level resonant converter clamped by resonant capacitor and transformer primary side Download PDFInfo
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- CN102237799A CN102237799A CN2011101943875A CN201110194387A CN102237799A CN 102237799 A CN102237799 A CN 102237799A CN 2011101943875 A CN2011101943875 A CN 2011101943875A CN 201110194387 A CN201110194387 A CN 201110194387A CN 102237799 A CN102237799 A CN 102237799A
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- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a three-level resonant converter clamped by a resonant capacitor and a transformer primary side. The converter can avoid the problems that a main switching tube loses zero-voltage switching during overloading or short circuit, a current stress of the main switching tube is over-high, and voltage stresses of two ends of the resonant capacitor are over-high. The three-level resonant converter comprises an input direct current power supply (Vin), a voltage division circuit (1), a first inversion bridge arm (2), a second inversion bridge arm (3), a resonant circuit (4), an isolation transformer (5), a rectification filtering circuit (6), auxiliary transformers and an auxiliary rectification circuit (7), wherein the resonant circuit (4) comprises the resonant capacitor, a resonant inductor and an excitation inductor. The auxiliary transformers are connected in parallel with two ends of the resonant capacitor, and voltages of two ends of the resonant capacitor are clamped to the input direct current power supply by a secondary side rectification circuit, so the aims of preventing the voltages of two ends of the resonant capacitor from being over-high during the over-loading or short circuit of the resonant converter and controlling the current stress of the switching tube are fulfilled.
Description
Technical field
The present invention relates to the DC converting technical field, relate in particular to the three-level resonant transformer that a kind of resonant capacitance adds the former limit of transformer clamp.
Background technology
In recent years, three-level DC converter is because its switch tube voltage stress only be half of input voltage, received concern widely in the application of high pressure occasion.In order to raise the efficiency and reduce the volume and weight of convertor device, the LLC harmonic technology DC converter of forming that combines with three level can be applied to the high-power occasion and have the characteristic of soft switch, become one of main topology that DC converter adopts in the high-power occasion, will further have been used and develop.
Three level full-bridge LLC controlled resonant converters as shown in Figure 1 are a kind of controlled resonant converters, and it is open-minded that the main switch of this converter is operated in no-voltage, and the secondary rectifier diode is operated in zero-current switching.Though three level full-bridge LLC controlled resonant converters have aforesaid advantage, yet when three level full-bridge LLC controlled resonant converter load overloads or short circuit, it is open-minded that main switch loses no-voltage, the main switch current stress is too high, the voltage at resonant capacitance two ends has rapid sudden change, thereby make the voltage at resonant capacitance two ends increase, when the voltage at its two ends exceeds the rated voltage of resonant capacitance, the situation generation that resonant capacitance is damaged even explode and the switching tube damage occurs, thereby generally speaking, it is bigger that the withstand voltage of resonant capacitance need be chosen, and this has increased device volume on the one hand, also increased cost on the other hand.
Summary of the invention
Problem to be solved by this invention is the defective that overcomes above-mentioned prior art, provide a kind of resonant capacitance to add the three-level resonant transformer of the former limit of transformer clamp, to lose no-voltage open-minded for main switch when this converter can avoid load overload or short circuit to occur, the problem that the main switch current stress is too high and resonant capacitance both end voltage stress is too high.
Technical scheme of the present invention is: the resonant capacitance that the present invention relates to adds the three-level resonant transformer of the former limit of transformer clamp, comprise input DC power, bleeder circuit, first inverter bridge leg, second inverter bridge leg, resonant circuit, isolating transformer and current rectifying and wave filtering circuit, described bleeder circuit is made up of the first input dividing potential drop electric capacity and the second input dividing potential drop capacitances in series and is connected in parallel on the DC power supply positive-negative output end; Described first inverter bridge leg and second inverter bridge leg are parallel to the two ends of bleeder circuit and form three level full-bridge circuits, the output of described three level full-bridge circuits connects resonant circuit, and described resonant circuit comprises resonant capacitance, resonant inductance and the magnetizing inductance that is in series; The former limit of described isolating transformer is parallel on the magnetizing inductance, secondary inserts described current rectifying and wave filtering circuit, the three-level resonant transformer that described resonant capacitance adds the former limit of transformer clamp also comprises auxiliary transformer and auxiliary rectifier circuit, described auxiliary transformer and auxiliary rectifier circuit comprise auxiliary transformer and auxiliary rectifier circuit, the former limit of auxiliary transformer is parallel to the both sides of resonant capacitance, links to each other with the input DC power two ends after secondary links to each other with described auxiliary rectifier circuit.
Further specifically, described first inverter bridge leg comprises the first tri-level inversion brachium pontis and first clamp circuit, the described first tri-level inversion brachium pontis comprises first switching tube, the second switch pipe, the 3rd switching tube, the 4th switching tube is composed in series successively, described first inverter bridge leg is connected in parallel on bleeder circuit two outputs, described first switching tube, the second switch pipe, the 3rd switching tube, the 4th a switching tube crystal diode in parallel separately and a parasitic capacitance, first clamp circuit comprises first diode, second diode, described first diode anode is connected in the series connection point of the described first input dividing potential drop electric capacity and the second input dividing potential drop electric capacity, described first diode cathode connects the contact of the first switching tube source electrode and the drain electrode of second switch pipe, second diode cathode is connected in the series connection point of the described first input dividing potential drop electric capacity and the second input dividing potential drop electric capacity, and anode connects the contact of the 3rd switching tube source electrode and the drain electrode of the 4th switching tube.
Further, described second inverter bridge leg comprises the second tri-level inversion brachium pontis and second clamp circuit, the described second tri-level inversion brachium pontis comprises the 5th switching tube, the 6th switching tube, the 7th switching tube, the 8th switching tube is composed in series successively, the described second tri-level inversion brachium pontis is connected in parallel on bleeder circuit two outputs, described the 5th switching tube, the 6th switching tube, the 7th switching tube, the 8th a switching tube individual diodes in parallel separately and a parasitic capacitance, second clamp circuit comprises the 3rd diode, the 4th diode, described the 3rd diode anode is connected in the series connection point of the described first input dividing potential drop electric capacity and the second input dividing potential drop electric capacity, described the 3rd diode cathode connects the contact of described the 5th switching tube source electrode and the drain electrode of the 6th switching tube, described the 4th diode cathode is connected in the series connection point of the first input dividing potential drop electric capacity and the second input dividing potential drop electric capacity, and described the 4th diode anode connects the contact of the 7th switching tube source electrode and the drain electrode of the 8th switching tube.
In concrete the enforcement, described current rectifying and wave filtering circuit is full bridge rectifier or centre cap full-wave rectifying circuit.
In concrete the enforcement, described auxiliary rectifier circuit is full bridge rectifier or centre cap full-wave rectifying circuit.
The invention has the beneficial effects as follows: owing to the present invention includes input DC power, bleeder circuit, first inverter bridge leg, second inverter bridge leg, resonant circuit, isolating transformer, current rectifying and wave filtering circuit, auxiliary transformer and auxiliary rectifier circuit, described resonant circuit comprises resonant capacitance resonant inductance and magnetizing inductance, since in the parallel connection of resonant capacitance two ends auxiliary transformer, and the resonant capacitance both end voltage is clamped to input DC power by secondary side rectification circuit, reached the too high purpose of resonant capacitance both end voltage when suppressing the overweight or short circuit of controlled resonant converter load, and under the situation that main circuit parameter is determined, when output short-circuit appears in controlled resonant converter, the switching tube current stress can be controlled jointly by input direct voltage and clamp circuit, to reach the controlled purpose of switching tube current stress.Described the present invention can solve when avoiding load overload or short circuit to occur main switch, and to lose no-voltage open-minded, the problem that the main switch current stress is too high and resonant capacitance both end voltage stress is too high.
Description of drawings
Fig. 1 is existing three-level resonant transformer electrical block diagram;
Fig. 2 adds the three-level resonant transformer electrical block diagram of the former limit of transformer clamp for resonant capacitance of the present invention;
Fig. 3 adds the main oscillogram of three-level resonant transformer of the former limit of transformer clamp for resonant capacitance of the present invention;
Fig. 4 ~ Fig. 9 adds the fundamental diagram of three-level resonant transformer under different working modes of the former limit of transformer clamp for resonant capacitance of the present invention.
Embodiment
Come the present invention is done further argumentation with the embodiment of embodiment below: when three-level resonant transformer load overload or short circuit, clamping action by auxiliary transformer of the present invention and auxiliary rectifier circuit with the voltage clamp of resonant capacitance at input voltage or corresponding magnitude of voltage, thereby it is open-minded to have avoided main switch to lose no-voltage, it is excessive to have suppressed the main switch current stress, reach the purpose controlled, and can get less resonant capacitance withstand voltage to save cost and to reduce device volume to primary current.
As shown in Figure 2, the present invention includes input DC power V
In, bleeder circuit 1, first inverter bridge leg 2, second inverter bridge leg 3, resonant circuit 4, isolating transformer 5, current rectifying and wave filtering circuit 6, auxiliary transformer and auxiliary rectifier circuit 7, described bleeder circuit 1 comprises the first input dividing potential drop capacitor C
1With the second input dividing potential drop capacitor C
2Be composed in series, described bleeder circuit 1 is connected in parallel on DC power supply V
InPositive-negative output end, described first inverter bridge leg 2 comprises the first tri-level inversion brachium pontis and first clamp circuit, the described first tri-level inversion brachium pontis comprises the first switching tube VS
1, second switch pipe VS
2, the 3rd switching tube VS
3, the 4th switching tube VS
4Be composed in series successively, described first inverter bridge leg 2 is connected in parallel on 1 liang of output of bleeder circuit, the described first switching tube VS
1, second switch pipe VS
2, the 3rd switching tube VS
3, the 4th switching tube VS
4A crystal diode in parallel separately and a parasitic capacitance, first clamp circuit comprises the first diode D
1, the second diode D
2, the described first diode D
1Anode is connected in the described first input dividing potential drop capacitor C
1With the second input dividing potential drop capacitor C
2Series connection point, the described first diode D
1Negative electrode connects the first switching tube VS
1Source electrode and second switch pipe VS
2Between the contact of drain electrode, the second diode D
2Negative electrode is connected in the described first input dividing potential drop capacitor C
1With the second input dividing potential drop capacitor C
2Series connection point, anode connects the 3rd switching tube VS
3Source electrode and the 4th switching tube VS
4Between the contact of drain electrode; Described second inverter bridge leg 3 comprises the second tri-level inversion brachium pontis and second clamp circuit, and the described second tri-level inversion brachium pontis is by the 5th switching tube VS
5, the 6th switching tube VS
6, the 7th switching tube VS
7, the 8th switching tube VS
8Be composed in series successively, be connected in parallel on 1 liang of output of bleeder circuit, described the 5th switching tube VS
5, the 6th switching tube VS
6, the 7th switching tube VS
7, the 8th switching tube VS
8An individual diodes in parallel separately and a parasitic capacitance, second clamp circuit comprises the 3rd diode D
3, the 4th diode D
4, described the 3rd diode D
3Anode is connected in the described first input dividing potential drop capacitor C
1With the second input dividing potential drop capacitor C
2Series connection point, described the 3rd diode D
3Negative electrode connects described the 5th switching tube VS
5Source electrode and the 6th switching tube VS
6The contact of drain electrode, described the 4th diode D
4Negative electrode is connected in the first input dividing potential drop capacitor C
1With the second input dividing potential drop capacitor C
2Series connection point, anode connects the 7th switching tube VS
7Source electrode and the 8th switching tube VS
8The contact of drain electrode; Described resonant circuit 4 comprises resonant capacitance C
S, resonant inductance L
SWith magnetizing inductance L
m, described resonant inductance L
SOne end connects described second switch pipe VS
2Source electrode and the 3rd switching tube VS
3The contact of drain electrode, described resonant inductance L
SThe other end and described resonant capacitance C
SLink to each other described resonant capacitance C
SOne end and resonant inductance L
SLink to each other, the other end links to each other with the end of the same name on described isolating transformer 5 former limits, described magnetizing inductance L
mBe connected in parallel on the former limit of described isolating transformer 5; The former limit end of the same name of described isolating transformer 5 and described resonant capacitance C
SLink to each other the different name end of described isolating transformer 5 and described the 6th switching tube VS
6Source electrode and described the 7th switching tube VS
7The contact of drain electrode links to each other, the secondary of described isolating transformer 5 comprises that the secondary winding of two identical numbers of turn is in series, the series connection point of described two secondary windings links to each other with the negative terminal of described current rectifying and wave filtering circuit 6, and two other disjunct terminal links to each other with two anodes of two all-waves of current rectifying and wave filtering circuit 6 respectively; Described auxiliary transformer and auxiliary rectifier circuit 7 comprise auxiliary transformer and auxiliary rectifier circuit, and the former limit of auxiliary transformer is parallel to resonant capacitance C
SAfter linking to each other with auxiliary rectifier circuit, both sides, secondary link to each other with the input DC power two ends.
Above-mentioned accompanying drawing 2 adds the three-level resonant transformer electrical block diagram of the former limit of transformer clamp for resonant capacitance of the present invention, in order better the operation principle of the three-level resonant transformer among Fig. 2 to be analyzed, the operation principle of basic three level full-bridge controlled resonant converters is at first described, a switch periods can be divided into 10 mode of operations, corresponding waveform as shown in Figure 3, the operation principle of 10 mode of operations is described below respectively:
Pattern 1[t
0, t
1], as shown in Figure 4: at t
0Constantly, VS
1, VS
2, VS
7, VS
8Open-minded simultaneously.Primary current in the resonant network
i pThe above-mentioned switching tube of flowing through, and be increased to maximum with sinusoidal rule forward and reduce then, flow through inductance L
mLinear the increasing of electric current; While secondary diode D
21Forward conduction, its electric current that flows through depends on primary current
i pAnd exciting current
i mPoor.
Pattern 2[t
1, t
2], as shown in Figure 5: at t
1Constantly, the electric current of resonant inductance Ls
i pElectric current with inductance L m
i mEquate that the transformer primary current will be zero, secondary current also reduces to zero, secondary rectifier diode D
21Zero-current switching.This moment magnetizing inductance L
mThe clamping action that breaks away from output voltage participates in resonant capacitance C
SWith the resonance inductance L
SResonant process between the three.Because L
mCompare L
SBig a lot, harmonic period is longer, at t
1~ t
2In, can be similar to and think that resonance current is constant.
Mode 3 [t
2, t
3], as shown in Figure 6: at t
2Constantly, VS
1And VS
8Prior to VS
2And VS
7Turn-off.A resonance current
i pBegin VS
1And VS
8Parasitic capacitance C
OSS1And C
OSS8(VS wherein
1To VS
8Parasitic capacitance be respectively C
OSS1C
OSS8, not shown) charge, simultaneously to VS
4And VS
5Parasitic capacitance C
OSS4And C
OSS5Discharge, therefore the parasitic capacitance of above-mentioned switching tube has also participated in resonant process.
Pattern 4[t
3, t
4], as shown in Figure 7: at t
3Constantly, parasitic capacitance C
OSS1And C
OSS8On voltage risen to V
In/ 2, clamping diode D
1And D
4Conducting is further risen thereby limited voltage; While parasitic capacitance C
OSS4And C
OSS5On voltage be zero also by clamp.This moment resonance current VS that flows through
2, VS
7And D
1, D
4
Pattern 5[t
4, t
5], as shown in Figure 8: at t
4Constantly, switching tube VS
2And VS
7Turn-off.This moment resonance current
i pBegin parasitic capacitance C
OSS2And C
OSS7Charge, simultaneously to parasitic capacitance C
OSS3And C
OSS6Discharge.So this stage, above-mentioned four parasitic capacitances also participated in resonant process.VS meanwhile
4And VS
5The parasitic diode conducting, reverse voltage bias not only is provided, make secondary rectifier diode D
22Conducting, magnetizing inductance L
mThereby be output voltage clamp and break away from resonant network.Equivalent circuit diagram when Fig. 9 is pattern 5 end, the circuit state that half period is about to begin under also can regarding as.
In fact, the process of mode 3 ~ pattern 5 is all very of short duration, and three's time sum was about for tens nanoseconds.
At the t5 moment of this stage end, C
OSS2And C
OSS7On voltage be V
In/ 2, C
OSS3And C
OSS6On voltage remain on zero, resonance current
i pVS flows through
3~ VS
6Parasitic diode, thereby satisfy VS
3~ VS
6The condition that no-voltage is opened.If this moment VS
3~ VS
6Open signal comes, controlled resonant converter will enter half work period of back.Because half work period of back is identical with the pattern of preceding half period, thereby no longer specifically set forth.
Under load overload or short-circuit conditions, resonant capacitance C
SIn guarantee the magnetic field energy of magnetizing inductance and provide the energy storage of electric energy all in resonant network, to circulate to load, cause resonant capacitance both end voltage stress very high, the withstand voltage of resonant capacitance is had very high requirement, magnetizing inductance L
mOn the numerical value that maintains before the short circuit of electric current constant, controlled resonant converter is no longer to the load transfer electric energy, resonant inductance L
SElectric current rises to very high level, connects with resonant network and the main switch that is in on-state will bear very high current stress, thereby causes its permanent failure even blast.Have resonant capacitance and add three level full-bridge controlled resonant converters of the former limit of auxiliary transformer clamp, by auxiliary transformer in parallel and be clamped to the mode of input both ends of power through auxiliary rectifier circuit at the resonant capacitance two ends, can be with resonant capacitance C
SVoltage clamp at a fixing magnitude of voltage; controlled resonant converter because of causing the too much circulating energy of resonant network, short circuit is fed back to fan-in network; thereby reach the purpose of restriction main switch current stress; the protection main switch is unlikely to permanent failure; reduced the size of resonant capacitance voltage stress, reduced the volume of device and saved the cost that installs.
It should be noted last that: above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although the present invention is had been described in detail with reference to the foregoing description, those of ordinary skill in the art is to be understood that: still can make amendment or be equal to replacement the present invention, and not breaking away from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed among the claim scope of the present invention.
Claims (5)
1. a resonant capacitance adds the three-level resonant transformer of the former limit of transformer clamp, comprises input DC power (V
In), bleeder circuit (1), first inverter bridge leg (2), second inverter bridge leg (3), resonant circuit (4), isolating transformer (5) and current rectifying and wave filtering circuit (6), described bleeder circuit (1) is by the first input dividing potential drop electric capacity (C
1) and the second input dividing potential drop electric capacity (C
2) be composed in series and be connected in parallel on DC power supply (V
In) positive-negative output end; Described first inverter bridge leg (2) and second inverter bridge leg (3) are parallel to the two ends of bleeder circuit (1) and form three level full-bridge circuits, the output of described three level full-bridge circuits connects resonant circuit (4), and described resonant circuit (4) comprises the resonant capacitance (C that is in series
S), resonant inductance (L
S) and magnetizing inductance (L
m); The former limit of described isolating transformer (5) is parallel to magnetizing inductance (L
m) on, secondary inserts described current rectifying and wave filtering circuit (6), it is characterized in that: the three-level resonant transformer that described resonant capacitance adds the former limit of transformer clamp also comprises auxiliary transformer and auxiliary rectifier circuit (7), described auxiliary transformer and auxiliary rectifier circuit (7) comprise auxiliary transformer and auxiliary rectifier circuit, and the former limit of auxiliary transformer is parallel to resonant capacitance (C
S) both sides, secondary link to each other with described auxiliary rectifier circuit the back with input DC power (V
In) two ends link to each other.
2. a kind of resonant capacitance according to claim 1 adds the three-level resonant transformer of the former limit of transformer clamp, it is characterized in that: described first inverter bridge leg (2) comprises the first tri-level inversion brachium pontis and first clamp circuit, and the described first tri-level inversion brachium pontis comprises the first switching tube (VS
1), second switch pipe (VS
2), the 3rd switching tube (VS
3), the 4th switching tube (VS
4) be composed in series successively, described first inverter bridge leg (2) is connected in parallel on bleeder circuit (1) two output, the described first switching tube (VS
1), second switch pipe (VS
2), the 3rd switching tube (VS
3), the 4th switching tube (VS
4) crystal diode in parallel separately and a parasitic capacitance, first clamp circuit comprises the first diode (D
1), the second diode (D
2), the described first diode (D
1) anode is connected in the described first input dividing potential drop electric capacity (C
1) and the second input dividing potential drop electric capacity (C
2) series connection point, the described first diode (D
1) negative electrode connects the first switching tube (VS
1) source electrode and second switch pipe (VS
2) drain electrode contact, the second diode (D
2) negative electrode is connected in the described first input dividing potential drop electric capacity (C
1) and the second input dividing potential drop electric capacity (C
2) series connection point, anode connects the 3rd switching tube (VS
3) source electrode and the 4th switching tube (VS
4) drain electrode contact.
3. a kind of resonant capacitance according to claim 1 adds the three-level resonant transformer of the former limit of transformer clamp, it is characterized in that: described second inverter bridge leg (3) comprises the second tri-level inversion brachium pontis and second clamp circuit, and the described second tri-level inversion brachium pontis comprises the 5th switching tube (VS
5), the 6th switching tube (VS
6), the 7th switching tube (VS
7), the 8th switching tube (VS
8) be composed in series successively, the described second tri-level inversion brachium pontis is connected in parallel on bleeder circuit (1) two output, described the 5th switching tube (VS
5), the 6th switching tube (VS
6), the 7th switching tube (VS
7), the 8th switching tube (VS
8) individual diodes in parallel separately and a parasitic capacitance, second clamp circuit comprises the 3rd diode (D
3), the 4th diode (D
4), described the 3rd diode (D
3) anode is connected in the described first input dividing potential drop electric capacity (C
1) and the second input dividing potential drop electric capacity (C
2) series connection point, described the 3rd diode (D
3) negative electrode connects described the 5th switching tube (VS
5) source electrode and the 6th switching tube (VS
6) drain electrode contact, described the 4th diode (D
4) negative electrode is connected in the first input dividing potential drop electric capacity (C
1) and the second input dividing potential drop electric capacity (C
2) series connection point, described the 4th diode (D
4) anode connects the 7th switching tube (VS
7) source electrode and the 8th switching tube (VS
8) drain electrode contact.
4. a kind of resonant capacitance according to claim 1 adds the three-level resonant transformer of the former limit of transformer clamp, it is characterized in that: described current rectifying and wave filtering circuit (6) is full bridge rectifier or centre cap full-wave rectifying circuit.
5. a kind of resonant capacitance according to claim 1 adds the three-level resonant transformer of the former limit of transformer clamp, it is characterized in that: described auxiliary rectifier circuit is full bridge rectifier or centre cap full-wave rectifying circuit.
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|---|---|---|---|
| CN2011101943875A CN102237799B (en) | 2011-07-12 | 2011-07-12 | Three-level resonant converter clamped by resonant capacitor and transformer primary side |
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|---|---|---|---|
| CN2011101943875A CN102237799B (en) | 2011-07-12 | 2011-07-12 | Three-level resonant converter clamped by resonant capacitor and transformer primary side |
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