CN103701353A - Soft switching control method of high-frequency link inverter - Google Patents
Soft switching control method of high-frequency link inverter Download PDFInfo
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Abstract
The invention relates to a soft switching control method of a high-frequency link inverter. A main circuit of the high-frequency link inverter comprises a DC (direct current)/DC frequency conversion module, a synchronous rectification module, a polarity selection module and an LC (inductance and capacitance) low pass filter which are sequentially connected, and a driving control module which is connected to the DC/DC frequency conversion module, the synchronous rectification module and the polarity selection module respectively. In the soft switching control method of the high-frequency link inverter, a forward power switch tube of the synchronous rectification module is controlled to be switched on before a forward power switch tube of the DC/ DC frequency conversion module is switched on, and to be switched off after the forward power switch tube of the DC/ DC frequency conversion module is switched off, and a negative power switch tube of the synchronous rectification module is controlled to be switched on before a negative power switch tube of the DC/DC frequency conversion module is switched on, and to be switched off after the negative power switch tube of the DC/DC frequency conversion module is switched off to enable the power switch tubes of the synchronous rectification module to be in a zero-voltage-on zero-current-off soft switching working mode. By the soft switching control method of the high-frequency link inverter, the switching loss of the synchronous rectification module is reduced and the efficiency and the power density of the high-frequency link inverter are increased.
Description
Technical field
The present invention relates to a kind of soft switching control method, particularly a kind of soft switching control method of high-frequency chain inverter.
Background technology
Along with the conflict of energy and environment problem is increasingly serious, inverter applications is more and more extensive.Inverter can directly be converted to AC power by DC power supply such as storage battery, fuel cell, photovoltaic solars, for power consumption equipment provides firm energy, simultaneously for improving energy conversion efficiency, more and more higher to the efficiency of inverter and power density requirement, so high-frequency chain inverter becomes inverter mainstream development direction.Be high-frequency chain inverter theory diagram as shown in Figure 2, input direct voltage is transformed to high-frequency direct-current pulse voltage through DC/DC conversion module and synchronous rectification module, polarity by power frequency period conducting is selected module and LC low pass filter, obtains stable alternating current.
The synchronous rectification modular power switching tube of existing high-frequency chain inverter generally adopts hard switching control method, synchronous rectification modular power switching tube is synchronizeed conducting and is turn-offed with the power switch pipe of DC/DC conversion module, the power switch pipe of now synchronous rectification module is in hard switching state, switching loss can be very large, when particularly switching frequency high frequencyization is applied, the switching loss of switching tube is more obvious for the impact of inverter efficiency.
Soft switch technique can reduce the switching loss of power switch pipe effectively.And the scheme of existing switching tube soft switch technique is generally classified as two classes, one class is to increase the resonant element devices such as electric capacity, inductance and diode to realize the no-voltage of switching tube and open and zero-current switching, another kind of is to increase auxiliary power switching tube to control (as shown in Figure 1), trigger resonant capacitance and resonant inductance and carry out resonance, thereby make master power switch pipe realize that no-voltage is opened or zero-current switching.These existing soft switch techniques are all realized by increasing extra resonant circuit or resonant element, and inverter volume is increased, and cost increases, and control difficulty simultaneously and strengthen, and have reduced reliability and the power density of inverter.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, providing a kind of is not increasing under the prerequisite of extra resonance components and parts, reduces the switching loss of synchronous rectification module, improves the efficiency of high-frequency chain inverter and the soft switching control method of power density.
For achieving the above object, technical scheme of the present invention is: a kind of soft switching control method of high-frequency chain inverter, the major loop of described high-frequency chain inverter comprises DC/DC conversion module, synchronous rectification module, polarity selection module and the LC low pass filter connecting successively, the major loop of described high-frequency chain inverter is also provided with a drive control module, be connected to respectively DC/DC conversion module, synchronous rectification module and polarity and select module, it is characterized in that:
Described drive control module produces two groups of SPWM that replace and drives wavelength-division not deliver to forward power switching tube and the negative sense power switch pipe of DC/DC conversion module;
Described drive control module produces two groups of forward power switching tube and negative sense power switch pipes that drive wavelength-division not deliver to corresponding synchronous rectification module that drive ripple complementation with described two groups of SPWM;
The power frequency that described drive control module also produces two groups of complementations drives ripple to deliver to polarity selection module;
Described method is specially the forward power switching tube of controlling synchronous rectification module, and to be ahead of the forward power switching tube of described DC/DC conversion module open-minded, and the forward power switching tube that lags behind described DC/DC conversion module turn-offs; It is open-minded that the negative sense power switch pipe of controlling described synchronous rectification module is ahead of the negative sense power switch pipe of described DC/DC conversion module, the negative sense power switch pipe that lags behind described DC/DC conversion module turn-offs, and realizes the power switch pipe of synchronous rectification module and in no-voltage, opens the soft switch pattern of zero-current switching.
Further, two groups of SPWM of the described forward power switching tube that is sent to DC/DC conversion module and negative sense power switch pipe drive ripple, are to drive ripple alternately to split and produce one group of complete SPWM.
In one embodiment, described DC/DC conversion module is for recommending boost type DC/DC conversion module, and the forward power switching tube of described DC/DC conversion module is for recommending the upper pipe that boosts, and the negative sense power switch pipe of DC/DC conversion module rises pressure down pipe for recommending; Described synchronous rectification module is bridge synchronization rectification module.
It is to be noted that the DC/DC variation module in the present invention is not limited to recommend boost type DC/DC conversion module, can be single-ended reverse exciting conversion module, single-end ortho-exciting conversion module, wherein forward power switching tube and negative sense power switch pipe are same power switch pipe, by sequential, make to control single power switch pipe and replace as forward power switching tube and negative sense power switch pipe successively in different phase; Also can be that semibridge system DC/DC changes module, full-bridge type DC/DC changes module etc.
In one embodiment, described synchronous rectification module is bridge synchronization rectification module, and synchronous rectification module of the present invention is not limited to bridge synchronization rectification module.
Further, the described boost type DC/DC conversion module of recommending comprises the upper pipe that boosts of recommending being connected in series, clamp capacitor, recommend and rise pressure down pipe, also comprise a transformer, describedly recommend the forward power switching tube that the upper pipe that boosts is DC/DC conversion module, recommend and rise the negative sense power switch pipe that pressure down pipe is DC/DC conversion module, described source electrode of recommending the upper pipe that boosts connects the second armature winding Same Name of Ends of clamp capacitor one end and transformer, describedly recommend the first armature winding different name end that the drain electrode of pipe on boosting pipe connects transformer, describedly recommend the first armature winding Same Name of Ends that the drain electrode of pipe under boosting pipe connects the clamp capacitor other end and transformer, describedly recommend the second armature winding different name end that the source electrode of pipe under boosting pipe connects transformer.
Further, described bridge synchronization rectification module is connected in parallel and is formed by the first power switch pipe group and the second power switch pipe group; described the first power switch pipe group is connected in series and is formed by the first power switch pipe and the second power switch pipe, the second power switch pipe group is connected in series and is formed by the 3rd power switch pipe and the 4th power switch pipe, wherein the first power switch pipe and the 4th power switch pipe are forward power switching tube, the second power switch pipe and the 3rd power switch pipe are negative sense power switch pipe, the drain electrode of the drain electrode of described the first power switch pipe and the 3rd power switch pipe is connected as an output of bridge synchronization rectification module, the source electrode of the source electrode of described the second power switch pipe and the 4th power switch pipe is connected as another output of bridge synchronization rectification module, the source electrode of described the first power switch pipe is connected to one end of the drain electrode of the second power switch pipe and the secondary winding of transformer as an input of bridge synchronization rectification module, the source electrode of described the 3rd power switch pipe is connected to the other end of the 4th drain electrode of power switch pipe and the secondary winding of transformer as another input of bridge synchronization rectification module.
Further, described polarity selection module the 3rd power switch pipe group and the 4th power switch pipe group are connected in parallel and form; Described the 3rd power switch pipe group is connected in series and is formed by the 5th power switch pipe and the 6th power switch pipe, the 4th power switch pipe group is connected in series and is formed by the 7th power switch pipe and the 8th power switch pipe, and the tie point of described the 5th power switch pipe and the 6th power switch pipe and the tie point of the 7th power switch pipe and the 8th power switch pipe are selected respectively the output of module as polarity; The 5th described power switch pipe and the tie point of the 7th power switch pipe are selected the first input end of module as polarity, the tie point of the 6th power switch pipe and the 8th power switch pipe is selected the second input of module as polarity.
Further, the drain electrode of described the 5th power switch pipe is connected with the drain electrode of the 7th power switch pipe to the drain electrode of the first power switch pipe and the drain electrode of the 3rd power switch pipe, the source electrode of described the 6th power switch pipe is connected with the source electrode of the 8th power switch pipe to the source electrode of the second power switch pipe and the source electrode of the 4th power switch pipe, the source electrode of described the 5th power switch pipe is connected with the 6th power switch pipe drain electrode, and the source electrode of described the 7th power switch pipe is connected with the drain electrode of the 8th power switch pipe.
The course of work of recommending boost type DC/DC conversion module and bridge synchronization rectification module further, is divided into four-stage capable of circulation:
First stage: recommend the upper pipe that boosts in off state, recommend and rise pressure down pipe in first stage initial time shutoff, the second power switch pipe and the 3rd power switch pipe are all in conducting state, the first power switch pipe and the 4th power switch pipe are in first stage initial time conducting, conducting constantly voltage is zero, realizes no-voltage open-minded;
Second stage: recommend the upper pipe that boosts in the conducting of second stage initial time, recommend and rise pressure down pipe maintenance shutoff, the first power switch pipe and the 4th power switch pipe keep conducting, the second power switch pipe and the 3rd power switch pipe turn-off at second stage initial time, cut-off current is zero, realizes zero-current switching;
Phase III: recommend the upper pipe that boosts and turn-off at phase III initial time, recommend and rise pressure down pipe maintenance shutoff, the first power switch pipe and the 4th power switch pipe keep conducting, the second power switch pipe and the 3rd power switch pipe are in phase III initial time conducting, conducting constantly voltage is zero, realizes no-voltage open-minded;
Fourth stage: recommend the upper pipe that boosts and keep turn-offing, recommend and rise pressure down pipe in the conducting of fourth stage initial time, the second power switch pipe and the 3rd power switch pipe keep conducting, the first power switch pipe and the 4th power switch pipe turn-off at fourth stage initial time, turn-offing electric current is constantly zero, realizes zero-current switching.
Further, described LC low pass filter is formed by connecting by inductance and capacitances in series.
Compared to prior art, the present invention has following beneficial effect:
1, soft switching control method of the present invention is not realized the shutoff of power switch pipe by extra increase auxiliary element;
2, reduce the switching loss of power switch pipe, improve inversion efficiency and power density;
3, reduce high frequency E MI and disturb, improve the reliability of whole digital control inversion system.
Accompanying drawing explanation
Fig. 1 is the exemplary plot that traditional increase auxiliary element is realized soft switch control technology.
Fig. 2 is high-frequency chain inverter theory diagram.
Fig. 3 is the high-frequency chain inverter schematic diagram in the present invention's one specific embodiment.
Fig. 4 is the work-based logic sequential chart of the present invention's one specific embodiment medium-high frequency chain inverter power switch pipe.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is specifically described.
As shown in Figure 2, the invention provides a kind of soft switching control method of high-frequency chain inverter, the major loop of described high-frequency chain inverter comprises DC/DC conversion module, synchronous rectification module, polarity selection module and the LC low pass filter connecting successively, the major loop of described high-frequency chain inverter is also provided with a drive control module, be connected to respectively DC/DC conversion module, synchronous rectification module and polarity and select module, it is characterized in that:
Two groups of SPWM that described drive control module produces alternately drive ripple to deliver to forward power switching tube and the negative sense power switch pipe of DC/DC conversion module;
Described drive control module produces two groups of forward power switching tube and negative sense power switch pipes that drive ripple to deliver to corresponding synchronous rectification module that drive ripple complementation with described two groups of SPWM;
The power frequency that described drive control module also produces two groups of complementations drives ripple to deliver to polarity selection module;
Described method is specially the forward power switching tube of controlling synchronous rectification module, and to be ahead of the forward power switching tube of described DC/DC conversion module open-minded, and the forward power switching tube that lags behind described DC/DC conversion module turn-offs; It is open-minded that the negative sense power switch pipe of controlling described synchronous rectification module is ahead of the negative sense power switch pipe of described DC/DC conversion module, the negative sense power switch pipe that lags behind described DC/DC conversion module turn-offs, and realizes the power switch pipe of synchronous rectification module and in no-voltage, opens the soft switch pattern of zero-current switching.
It is below the specific embodiment of the invention.
As shown in the high-frequency chain inverter schematic diagram in Fig. 3 the present invention one specific embodiment, major loop selects module, LC low pass filter to connect and compose successively by recommending boost type DC/DC conversion module, bridge synchronization rectification module, polarity, wherein DC/DC conversion module, synchronous rectification module, polarity select the control signal of module to be connected to respectively a drive control module, wherein recommend boost type DC/DC conversion module by recommending the upper pipe MOS1 that boosts, recommend rise pressure down pipe MOS2, clamp capacitor C2, transformer T1 forms; Bridge synchronization rectification module is comprised of power switch pipe MOS11, power switch pipe MOS12, power switch pipe MOS21 and power switch pipe MOS22; Polarity selects module to be comprised of power switch pipe MOS41, power switch pipe MOS42, power switch pipe MOS51, power switch pipe MOS52; LC low pass filter is comprised of inductance L 1 and capacitor C 1.
Describedly recommend the second armature winding Same Name of Ends that the source electrode of managing MOS1 on boosting pipe meets clamp capacitor C2 one end, transformer T1, the drain electrode of described power switch pipe MOS1 connects the first armature winding different name end of transformer T1, describedly recommend the first armature winding Same Name of Ends that the drain electrode of managing MOS2 under boosting pipe meets the clamp capacitor C2 other end, transformer T1, described in recommend the second armature winding different name end that the source electrode of managing MOS2 under boosting pipe meets transformer T1, the drain electrode of described power switch pipe MOS11, the drain electrode of power switch pipe MOS21, the drain electrode of power switch pipe MOS41, the drain electrode of power switch pipe MOS51 is connected, the source electrode of described power switch pipe MOS22, the source electrode of power switch pipe MOS12, the source electrode of power switch pipe MOS51, the source electrode of power switch pipe MOS41 is connected, the source electrode of described power switch pipe MOS11 is connected to the drain electrode of power switch pipe MOS22, one end of the secondary winding of transformer T1, the source electrode of described power switch pipe MOS21 is connected to the drain electrode of power switch pipe MOS12, the other end of the secondary winding of transformer T1, the source electrode of described power switch pipe MOS41 is connected to the drain electrode of power switch pipe MOS52, the source electrode of described power switch pipe MOS51 is connected to the drain electrode of power switch pipe MOS42.
Described drive control module, drives ripple alternately to split one group of complete SPWM, produces two groups of SPWM that replace and drives ripple to deliver to power switch pipe MOS1 and the power switch pipe MOS2 that recommends boost type DC/DC conversion module;
Described drive control module, produces one group and drives complementary driving ripple to deliver to power switch pipe MOS21 and the power switch pipe MOS22 of bridge synchronization rectification module with the SPWM that recommends the upper pipe MOS1 that boosts;
Described drive control module, produce one group with recommend the SPWM that rises pressure down pipe MOS2 and drive complementary driving ripple to deliver to power switch pipe MOS11 and the power switch pipe MOS12 of bridge synchronization rectification module;
Described drive control module, the power frequency period that produces two groups of complementations drives wavelength-division not deliver to power switch pipe MOS41, MOS42 and power switch pipe MOS51, the MOS52 of bridge-type polarity selecting circuit.
Whole circuit working principle is as follows:
Power switch pipe MOS1, power switch pipe MOS11, power switch pipe MOS12, capacitor C 2 and transformer T1 form forward boost rectifying circuit, power switch pipe MOS2, power switch pipe MOS21, power switch pipe MOS22, capacitor C 2 and transformer T1 form negative sense boost rectifying circuit, input direct voltage is transformed into high-frequency direct-current pulse voltage, and high-frequency direct-current pulse voltage is selected the alternating voltage of module and LC low pass filter stable output through polarity.
Wherein recommending the upper pipe MOS1 that boosts is the forward power switching tube that DC/DC changes module, recommending and rising pressure down pipe MOS2 is that negative sense power switch pipe, power switch pipe MOS11, the MOS12 that DC/DC changes module is synchronous rectification module forward power switching tube, and power switch pipe MOS21, MOS22 are synchronous rectification module negative sense power switch pipe.
Wherein at boost rectifying circuit, control rectification module power switch pipe MOS11 and power switch pipe MOS12 and be ahead of that to recommend the upper pipe MOS1 that boosts open-minded, lag behind and recommend the upper pipe MOS1 shutoff of boosting, power ratio control switching tube MOS21 and power switch pipe MOS22 are ahead of and recommend that to rise pressure down pipe MOS2 open-minded, lag behind to recommend and rise pressure down pipe MOS2 and turn-off, the power switch pipe of bridge synchronization rectification module works in the soft switching mode that no-voltage is opened zero-current switching.
The course of work of recommending boost type DC/DC conversion module and bridge synchronization rectification module is divided into four operation intervals capable of circulation:
[1] in [t0, the t1] period:
---recommend the upper pipe MOS1 that boosts and keep off state;
---recommend and rise pressure down pipe MOS2 and constantly turn-off and keep off state at t0;
---bridge synchronization rectification modular power switching tube MOS11 and power switch pipe MOS12 are in t0 conducting constantly and keep conducting state;
---bridge synchronization rectification modular power switching tube MOS21 and power switch pipe MOS22 keep conducting state.
Because recommending the upper pipe MOS1 that boosts, rise pressure down pipe MOS2 all in off state with recommending, the secondary output end voltage of transformer is zero, and the power switch pipe MOS11 of synchronous rectification module and power switch pipe MOS12 are in t0 conducting constantly, realize no-voltage open-minded, for the energy transmission of next stage ready in advance.
[2] in [t1, the t2] period:
---recommend the upper pipe MOS1 that boosts in t1 conducting constantly and keep conducting state;
---recommend and rise pressure down pipe MOS2 maintenance off state;
---bridge synchronization rectification modular power switching tube MOS11 and power switch pipe MOS12 keep conducting state;
---bridge synchronization rectification modular power switching tube MOS21 and power switch pipe MOS22 constantly turn-off and keep off state at t1.
Recommend and boost upper pipe MOS1 when t1 conducting constantly, corresponding bridge synchronization rectification modular power switching tube MOS11 and power switch pipe MOS12 are ahead of and recommend the upper pipe MOS1 that boosts in t0 conducting constantly, input dc power carries out the forward rectification of boosting, output high-frequency direct-current pulse voltage by recommending boost upper pipe MOS1 and bridge synchronization rectification mould power switch pipe MOS11, MOS12.
Because recommending, rise pressure down pipe MOS2 and keep off state in t1 ~ t2 period, the negative sense rectification circuit electric current of bridge synchronization rectification module is zero, and bridge synchronization rectification modular power switching tube MOS21 and power switch pipe MOS22 turn-off constantly at t1, realize zero-current switching.
[3] in [t2, the t3] period:
---recommend the upper pipe MOS1 that boosts and constantly turn-off and keep off state at t2;
---recommend and rise pressure down pipe MOS2 maintenance off state;
---bridge synchronization rectification modular power switching tube MOS11 and power switch pipe MOS12 keep conducting state;
---bridge synchronization rectification modular power switching tube MOS21 and power switch pipe MOS22 are in t2 conducting constantly and keep conducting state.
Because recommending the upper pipe MOS1 that boosts, rise pressure down pipe MOS2 all in off state with recommending, the secondary output end voltage of transformer is zero, and the power switch pipe MOS21 of synchronous rectification module and power switch pipe MOS22 are in t2 conducting constantly, realize no-voltage open-minded, for the energy transmission of next stage ready in advance.
[4] in [t3, the t4] period:
---recommend the upper pipe MOS1 that boosts and keep off state;
---recommend and rise pressure down pipe MOS2 in t3 conducting constantly and keep conducting state;
---bridge synchronization rectification modular power switching tube MOS11 and power switch pipe MOS12 constantly turn-off and keep off state at t3;
---bridge synchronization rectification modular power switching tube MOS21 and power switch pipe MOS22 keep conducting state.
Recommend and rise pressure down pipe MOS2 when t3 conducting constantly, corresponding bridge synchronization rectification modular power switching tube MOS21 and power switch pipe MOS22 are ahead of to recommend and rise pressure down pipe MOS2 in t2 conducting constantly, input dc power rises pressure down pipe MOS2 and bridge synchronization rectification modular power switching tube MOS21, MOS22 and carries out the negative sense rectification of boosting, output high-frequency direct-current pulse voltage by recommending.
Because recommending the upper pipe MOS1 that boosts, in t3 ~ t4 period, keep off state, the forward rectification circuit electric current of bridge synchronization rectification module is zero, and bridge synchronization rectification modular power switching tube MOS11 and power switch pipe MOS12 turn-off constantly at t3, realize zero-current switching.
Wherein, t0 ~ t4 is of the high-frequency chain inverter rectification duty cycle control cycle that boosts, and realizes the power switch pipe of bridge synchronization rectification module and in no-voltage, open the soft switch pattern of zero-current switching on the logical sequence of recommending between boost type DC/DC conversion module and bridge synchronization rectification module.
The foregoing is only preferred embodiment of the present invention; the object, technical solutions and advantages of the present invention are further described; not in order to limit the present invention; within the spirit and principles in the present invention all; any modification of doing, be equal to replacement, improvement etc., within protection scope of the present invention all should be included in.
Claims (7)
1. the soft switching control method of a high-frequency chain inverter, the major loop of described high-frequency chain inverter comprises DC/DC conversion module, synchronous rectification module, polarity selection module and the LC low pass filter connecting successively, the major loop of described high-frequency chain inverter is also provided with a drive control module, be connected to respectively DC/DC conversion module, synchronous rectification module and polarity and select module, it is characterized in that:
Described drive control module produces two groups of SPWM that replace and drives wavelength-division not deliver to forward power switching tube and the negative sense power switch pipe of DC/DC conversion module;
Described drive control module produces two groups of forward power switching tube and negative sense power switch pipes that drive wavelength-division not deliver to corresponding synchronous rectification module that drive ripple complementation with described two groups of SPWM;
The power frequency that described drive control module also produces two groups of complementations drives ripple to deliver to polarity selection module;
Described method is specially the forward power switching tube of controlling synchronous rectification module, and to be ahead of the forward power switching tube of described DC/DC conversion module open-minded, and the forward power switching tube that lags behind described DC/DC conversion module turn-offs; It is open-minded that the negative sense power switch pipe of controlling described synchronous rectification module is ahead of the negative sense power switch pipe of described DC/DC conversion module, the negative sense power switch pipe that lags behind described DC/DC conversion module turn-offs, and realizes the power switch pipe of synchronous rectification module and in no-voltage, opens the soft switch pattern of zero-current switching.
2. the soft switching control method of high-frequency chain inverter according to claim 1, it is characterized in that: two groups of SPWM of the described forward power switching tube that is sent to DC/DC conversion module and negative sense power switch pipe drive ripple, is to drive ripple alternately to split and produce one group of complete SPWM.
3. the soft switching control method of high-frequency chain inverter according to claim 1, is characterized in that: described DC/DC conversion module is for recommending boost type DC/DC conversion module, and described synchronous rectification module is bridge synchronization rectification module.
4. the soft switching control method of high-frequency chain inverter according to claim 3, it is characterized in that: described in recommend boost type DC/DC conversion module and comprise the upper pipe that boosts of recommending being connected in series, clamp capacitor, recommend and rise pressure down pipe, also comprise a transformer, describedly recommend the forward power switching tube that the upper pipe that boosts is DC/DC conversion module, recommend and rise the negative sense power switch pipe that pressure down pipe is DC/DC conversion module, described source electrode of recommending the upper pipe that boosts connects the second armature winding Same Name of Ends of clamp capacitor one end and transformer, describedly recommend the first armature winding different name end that the drain electrode of pipe on boosting pipe connects transformer, describedly recommend the first armature winding Same Name of Ends that the drain electrode of pipe under boosting pipe connects the clamp capacitor other end and transformer, describedly recommend the second armature winding different name end that the source electrode of pipe under boosting pipe connects transformer.
5. the soft switching control method of high-frequency chain inverter according to claim 4, is characterized in that: described bridge synchronization rectification module is connected in parallel and is formed by the first power switch pipe group and the second power switch pipe group; described the first power switch pipe group is connected in series and is formed by the first power switch pipe and the second power switch pipe, the second power switch pipe group is connected in series and is formed by the 3rd power switch pipe and the 4th power switch pipe, wherein the first power switch pipe and the 4th power switch pipe are forward power switching tube, the second power switch pipe and the 3rd power switch pipe are negative sense power switch pipe, the drain electrode of the drain electrode of described the first power switch pipe and the 3rd power switch pipe is connected as an output of bridge synchronization rectification module, the source electrode of the source electrode of described the second power switch pipe and the 4th power switch pipe is connected as another output of bridge synchronization rectification module, the source electrode of described the first power switch pipe is connected to one end of the drain electrode of the second power switch pipe and the secondary winding of transformer as an input of bridge synchronization rectification module, the source electrode of described the 3rd power switch pipe is connected to the other end of the 4th drain electrode of power switch pipe and the secondary winding of transformer as another input of bridge synchronization rectification module.
6. the soft switching control method of high-frequency chain inverter according to claim 1, is characterized in that: described polarity selection module the 3rd power switch pipe group and the 4th power switch pipe group are connected in parallel and form; Described the 3rd power switch pipe group is connected in series and is formed by the 5th power switch pipe and the 6th power switch pipe, the 4th power switch pipe group is connected in series and is formed by the 7th power switch pipe and the 8th power switch pipe, and the tie point of described the 5th power switch pipe and the 6th power switch pipe and the tie point of the 7th power switch pipe and the 8th power switch pipe are selected respectively the output of module as polarity; The 5th described power switch pipe and the tie point of the 7th power switch pipe are selected the first input end of module as polarity, the tie point of the 6th power switch pipe and the 8th power switch pipe is selected the second input of module as polarity.
7. the soft switching control method of high-frequency chain inverter according to claim 5, is characterized in that: described in recommend boost type DC/DC conversion module and bridge synchronization rectification module the course of work be divided into four-stage capable of circulation:
First stage: recommend the upper pipe that boosts in off state, recommend and rise pressure down pipe in first stage initial time shutoff, the second power switch pipe and the 3rd power switch pipe are all in conducting state, the first power switch pipe and the 4th power switch pipe are in first stage initial time conducting, conducting constantly voltage is zero, realizes no-voltage open-minded;
Second stage: recommend the upper pipe that boosts in the conducting of second stage initial time, recommend and rise pressure down pipe maintenance shutoff, the first power switch pipe and the 4th power switch pipe keep conducting, the second power switch pipe and the 3rd power switch pipe turn-off at second stage initial time, cut-off current is zero, realizes zero-current switching;
Phase III: recommend the upper pipe that boosts and turn-off at phase III initial time, recommend and rise pressure down pipe maintenance shutoff, the first power switch pipe and the 4th power switch pipe keep conducting, the second power switch pipe and the 3rd power switch pipe are in phase III initial time conducting, conducting constantly voltage is zero, realizes no-voltage open-minded;
Fourth stage: recommend the upper pipe that boosts and keep turn-offing, recommend and rise pressure down pipe in the conducting of fourth stage initial time, the second power switch pipe and the 3rd power switch pipe keep conducting, the first power switch pipe and the 4th power switch pipe turn-off at fourth stage initial time, turn-offing electric current is constantly zero, realizes zero-current switching.
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| CN1665115A (en) * | 2004-11-22 | 2005-09-07 | 深圳普达电源技术有限公司 | A high-efficiency zero-voltage switch type DC power transformer |
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| CN1665115A (en) * | 2004-11-22 | 2005-09-07 | 深圳普达电源技术有限公司 | A high-efficiency zero-voltage switch type DC power transformer |
| US20100232180A1 (en) * | 2009-03-10 | 2010-09-16 | Hitachi, Ltd. | Power supply unit, hard disk drive and method of switching the power supply unit |
| US20120147629A1 (en) * | 2010-12-10 | 2012-06-14 | Futurewei Technologies, Inc. | Soft Switching DC/DC Converters and Methods |
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