CN203352447U - Soft switch half-bridge circuit - Google Patents
Soft switch half-bridge circuit Download PDFInfo
- Publication number
- CN203352447U CN203352447U CN2013203404648U CN201320340464U CN203352447U CN 203352447 U CN203352447 U CN 203352447U CN 2013203404648 U CN2013203404648 U CN 2013203404648U CN 201320340464 U CN201320340464 U CN 201320340464U CN 203352447 U CN203352447 U CN 203352447U
- Authority
- CN
- China
- Prior art keywords
- tube
- connects
- bridge circuit
- switch pipe
- switching tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000004804 winding Methods 0.000 claims abstract description 32
- 239000003990 capacitor Substances 0.000 claims abstract description 26
- 230000005669 field effect Effects 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 abstract description 5
- 230000000903 blocking effect Effects 0.000 abstract 2
- 230000008901 benefit Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 208000032365 Electromagnetic interference Diseases 0.000 description 1
- 206010044565 Tremor Diseases 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Landscapes
- Rectifiers (AREA)
- Dc-Dc Converters (AREA)
Abstract
The utility model discloses a soft switch half-bridge circuit, including first switch tube Q1, second switch tube Q2, blocking electric capacity Cr, transformer T, first rectifier tube DR1, second rectifier tube DR2, filter capacitor C and load R. The drain electrode of the first switching tube Q1 is connected with the positive end of a power supply, the source electrode of the first switching tube Q1 is connected with the drain electrode of the second switching tube Q2, and the source electrode of the second switching tube Q2 is connected with the negative end of the power supply; the transformer T comprises a primary winding and a secondary winding; two connecting ends of the primary winding are respectively communicated with a drain electrode and a source electrode of a second switching tube Q2; the blocking capacitor Cr is connected in series with a primary side circuit of the transformer T; the first rectifier tube DR1, the second rectifier tube DR2, the filter capacitor C and the load R are connected to the secondary line. The utility model discloses can improve the application property of circuit, realize the ZVS of switch tube in great load range and open, reduce switch tube power loss, reduce the degree of difficulty of the synchronous rectification of output simultaneously.
Description
Technical field
The utility model relates to electronic technology field, relates in particular to a kind of soft switch semi-bridge circuit.
Background technology
At present, the soft switch semi-bridge circuit mainly contains two kinds: LLC resonance half-bridge circuit and asymmetry half-bridge circuit.
As shown in Figure 1, be the structure chart of LLC resonance half-bridge circuit of the prior art.This LLC resonance half-bridge circuit is PFM(Pulse frequency modulation, pulse frequency modulated) circuit, utilize resonant inductance Lr and switching tube junction capacitance resonance, when switching tube is opened, its voltage resonance is extremely zero, realize ZVS(Zero Voltage Switch, zero voltage switch) open-minded.
Concrete, the operation principle of LLC resonance half-bridge circuit is as follows: switching tube Q1 and switching tube Q2 alternate conduction, conducting half period respectively.When switching tube Q1 conducting, the diode DR1 conducting on transformer T secondary, all the other turn-off, and the former limit of transformer T is to the secondary transferring energy; When switching tube Q2 conducting, the diode DR2 conducting on transformer T secondary, all the other turn-off, and the former limit of transformer T is to the secondary transferring energy.
The circuit framework of asymmetry half-bridge circuit is identical with the LLC resonance half-bridge circuit shown in Fig. 1, and difference is the difference on control mode.Asymmetry half-bridge circuit is PWM(Pulse Width Modulation, pulse width modulation) circuit, be equally also to utilize resonant inductance Lr and switching tube junction capacitance resonance, when switching tube is opened, its voltage resonance, to zero, is realized to ZVS is open-minded.
Concrete, the operation principle of asymmetry half-bridge circuit is as follows: switching tube Q1 and switching tube Q2 alternate conduction, drive complementation, and the ON time of switching tube Q1 is less than 50%, and the ON time of switching tube Q2 is greater than 50%.When switching tube Q1 conducting, the diode DR1 conducting on transformer T secondary, all the other turn-off, and the former limit of transformer T is to the secondary transferring energy; When switching tube Q2 conducting, the diode DR2 conducting on transformer T secondary, all the other turn-off, and the former limit of transformer T is to the secondary transferring energy.
Yet there is following shortcoming in above-mentioned LLC resonance half-bridge circuit: the transformer secondary does not have filter inductance, cause the output ripple electric current large, the electrochemical capacitor that demand is very many, and the electrochemical capacitor heating is large, and the life-span is lower.And, because secondary does not have the output inductor current limliting, during as synchronous rectification, need additional IC to drive.
There is following shortcoming in above-mentioned asymmetry half-bridge circuit: drive asymmetricly, upper pipe (switching tube Q1) is difficult to realize ZVS, and there is resonant inductance in transformer primary side, has duty-cycle loss.
Summary of the invention
The utility model proposes a kind of soft switch semi-bridge circuit, can improve the application performance of circuit, in than the heavy load scope, realize that the ZVS of switching tube is open-minded, reduced the switching tube power loss, reduced the difficulty of output synchronous rectification simultaneously.
The utility model provides a kind of soft switch semi-bridge circuit, comprises the first switching tube Q1, second switch pipe Q2, capacitance Cr, transformer T, the first rectifying tube DR1, the second rectifying tube DR2, filter capacitor C and load R;
The drain electrode of described the first switching tube Q1 connects power positive end, and the source electrode of described the first switching tube Q1 connects the drain electrode of described second switch pipe Q2, and the source electrode of described second switch pipe Q2 connects power supply negative terminal;
Described transformer T comprises former limit winding and secondary winding; The first link of described former limit winding is communicated with the drain electrode of described second switch pipe Q2, and the second link of described former limit winding is communicated with the source electrode of described second switch pipe Q2; The first link of described secondary winding connects the anode of described the first rectifying tube DR1, and the second link of described secondary winding connects the anode of described the second rectifying tube DR2, and the negative terminal of described the second rectifying tube DR2 connects the negative terminal of described the first rectifying tube DR1; The negative terminal of described the first rectifying tube DR1 also is communicated with the end of described filter capacitor C, and the other end of described filter capacitor C connects the 3rd link of described secondary winding;
Described capacitance Cr is connected on the former sideline road of described transformer T; Described load R and described filter capacitor C parallel connection.
Further, described circuit also comprises filter inductance L; The negative terminal of described the first rectifying tube DR1 also is communicated with the end of described filter capacitor C, is specially: the negative terminal of described the first rectifying tube DR1 connects the end of described filter capacitor C by described filter inductance L.
Further, described circuit also comprises the first diode D1 and the second diode D2; The positive pole of described the first diode D1 connects the source electrode of described the first switching tube Q1, and the negative pole of described the first diode D1 connects the drain electrode of described the first switching tube Q1; The positive pole of described the second diode D2 connects the source electrode of described second switch pipe Q2, and the negative pole of described the second diode D2 connects the drain electrode of described second switch pipe Q2.
The soft switch semi-bridge circuit that the utility model embodiment provides, connect a filter inductance at the transformer secondary, and secondary output ripple electric current is significantly reduced, and can improve the life-span of output electrochemical capacitor.Simultaneously, due to the existence of output inductor, electric current can not suddenly change, and when realizing synchronous rectification, can realize driving simply mutually.And, can improve the application performance of circuit, realize that the ZVS of switching tube is open-minded in than the heavy load scope, reduced the switching tube power loss.
The accompanying drawing explanation
Fig. 1 is the structural representation of LLC resonance half-bridge circuit of the prior art;
Fig. 2 is the structural representation of an embodiment of the soft switch semi-bridge circuit that provides of the utility model;
Fig. 3 is the structural representation of another embodiment of the soft switch semi-bridge circuit that provides of the utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described.
Referring to Fig. 2, it is the structural representation of an embodiment of the soft switch semi-bridge circuit that provides of the utility model.
The present embodiment provides a kind of soft switch semi-bridge circuit, comprises the first switching tube Q1, second switch pipe Q2, capacitance Cr, transformer T, the first rectifying tube DR1, the second rectifying tube DR2, filter capacitor C and load R; Specific as follows:
The drain electrode of the first switching tube Q1 connects power positive end, and the source electrode of the first switching tube Q1 connects the drain electrode of second switch pipe Q2, and the source electrode of second switch pipe Q2 connects power supply negative terminal.
Transformer T comprises former limit winding and secondary winding; The first link of former limit winding is communicated with the drain electrode of second switch pipe Q2, and the second link of former limit winding is communicated with the source electrode of second switch pipe Q2; The first link of secondary winding connects the anode of the first rectifying tube DR1, and the second link of secondary winding connects the anode of the second rectifying tube DR2, and the negative terminal of the second rectifying tube DR2 connects the negative terminal of the first rectifying tube DR1; The negative terminal of the first rectifying tube DR1 also is communicated with the end of filter capacitor C, and the other end of filter capacitor C connects the 3rd link of secondary winding.
Capacitance Cr is connected on the former sideline road of transformer T; Load R and filter capacitor C parallel connection.
Further, the soft switch semi-bridge circuit that the present embodiment provides also comprises filter inductance L; The negative terminal of the first above-mentioned rectifying tube DR1 also is communicated with the end of filter capacitor C, is specially: the negative terminal of the first rectifying tube DR1 connects the end of filter capacitor C by described filter inductance L.
In one embodiment, as shown in Figure 2, the first link of above-mentioned former limit winding is communicated with the drain electrode of described second switch pipe Q2, is specially: the first link of former limit winding connects the drain electrode of second switch pipe Q2 by capacitance Cr.
Referring to Fig. 3, it is the structural representation of another embodiment of the soft switch semi-bridge circuit that provides of the utility model.
In another embodiment, as shown in Figure 3, the second link of above-mentioned former limit winding is communicated with the source electrode of second switch pipe Q2, is specially: the second link of former limit winding connects the source electrode of second switch pipe Q2 by capacitance Cr.
Two above-mentioned execution modes are also that capacitance Cr is connected on the execution mode on the former sideline road of transformer T.
Preferably, the soft switch semi-bridge circuit that the present embodiment provides also comprises the first diode D1 and the second diode D2; The positive pole of the first diode D1 connects the source electrode of the first switching tube Q1, and the negative pole of the first diode D1 connects the drain electrode of the first switching tube Q1; The positive pole of the second diode D2 connects the source electrode of second switch pipe Q2, and the negative pole of the second diode D2 connects the drain electrode of second switch pipe Q2.
Above-mentioned the first switching tube Q1 and second switch pipe Q2 are insulating gate type field effect tube.Above-mentioned the first rectifying tube DR1 and the second rectifying tube DR2 are diode.
It should be noted that, the inductance L m shown in Fig. 2 and Fig. 3 is the magnetizing inductance of transformer, rather than an in esse electronic component.
The operation principle of the soft switch semi-bridge circuit that the utility model provides is as follows:
When the first switching tube Q1 conducting, primary current by the first switching tube Q1, transformer T and capacitor C r, is got back to power supply negative terminal by power positive end.Transformer T sets up high pressure at the different name end, the first rectifying tube DR1 conducting, and former limit is to the secondary transferring energy.When closing, the first switching tube Q1 has no progeny, the secondary inductance afterflow, and electric current by load R, transformer T and the first rectifying tube DR1, is got back to the other end of filter inductance L by the end of filter inductance L, and the while is set up the voltage of a Same Name of Ends high pressure on former limit.Outputting inductance feeds back to former limit and participates in resonance, and resonance current is given the first switching tube Q1 junction capacitance charging, to second switch pipe Q2 junction capacitance, discharges simultaneously.After voltage is zero on second switch pipe Q2 junction capacitance, provide the driving of second switch pipe Q2, realize the soft switch of second switch pipe Q2.Second switch pipe Q2 conducting, the second rectifying tube DR2 conducting, the first rectifying tube DR1 turn-offs, and continue to the secondary transferring energy on former limit.
The soft switch of the first switching tube Q1 realize principle, realize that to the soft switch of above-mentioned second switch pipe Q2 principle is similar, at this, no longer describe in detail.
With LLC resonance half-bridge circuit of the prior art, compare, the soft switch semi-bridge circuit that the utility model provides has the following advantages: resonant inductance has been lacked on the former limit of this soft switch semi-bridge circuit, when normal operation, primary current is triangular wave, and LLC resonance half-bridge circuit of the prior art is sinusoidal wave; And, the secondary of this soft switch semi-bridge circuit is a many output inductor, secondary output ripple electric current significantly reduces, and there is to great benefit in life-span of output electrochemical capacitor.Simultaneously, due to the existence of output inductor, electric current can not suddenly change, and when realizing synchronous rectification, can realize driving simply mutually.
With asymmetry half-bridge circuit of the prior art, compare, the soft switch semi-bridge circuit that the utility model provides has the following advantages: resonant inductance has been lacked on former limit, therefore there do not is duty-cycle loss, and as trembling design frequently, to EMI(Electro-Magnetic Interference, electromagnetic interference) great benefit arranged.Simultaneously, symmetrical owing to driving, and keep constant, the platform voltage on rectifier diode DR1, the DR2 of secondary can be relatively low.When switching tube is opened, secondary filter inductance L feeds back to former limit and participates in resonance, more easily realizes soft switch.And asymmetrical half-bridge of the prior art is only when lower pipe is opened, secondary filter inductance L just participates in resonance, and therefore upper pipe is difficult to realize the soft switch of ZVS.
The topology of regulating as PFM, this soft switch semi-bridge circuit changes to control the variation of output voltage by regulating frequency, because there is Dead Time in the switching tube of alternate conduction, improve frequency, can increase the accounting of Dead Time, reduces output voltage.Reduce frequency, can reduce the accounting of Dead Time, increase output voltage.
The above is preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also are considered as protection range of the present utility model.
Claims (7)
1. a soft switch semi-bridge circuit, is characterized in that, comprises the first switching tube Q1, second switch pipe Q2, capacitance Cr, transformer T, the first rectifying tube DR1, the second rectifying tube DR2, filter capacitor C and load R;
The drain electrode of described the first switching tube Q1 connects power positive end, and the source electrode of described the first switching tube Q1 connects the drain electrode of described second switch pipe Q2, and the source electrode of described second switch pipe Q2 connects power supply negative terminal;
Described transformer T comprises former limit winding and secondary winding; The first link of described former limit winding is communicated with the drain electrode of described second switch pipe Q2, and the second link of described former limit winding is communicated with the source electrode of described second switch pipe Q2; The first link of described secondary winding connects the anode of described the first rectifying tube DR1, and the second link of described secondary winding connects the anode of described the second rectifying tube DR2, and the negative terminal of described the second rectifying tube DR2 connects the negative terminal of described the first rectifying tube DR1; The negative terminal of described the first rectifying tube DR1 also is communicated with the end of described filter capacitor C, and the other end of described filter capacitor C connects the 3rd link of described secondary winding;
Described capacitance Cr is connected on the former sideline road of described transformer T; Described load R and described filter capacitor C parallel connection.
2. soft switch semi-bridge circuit as claimed in claim 1, is characterized in that, described circuit also comprises filter inductance L;
The negative terminal of described the first rectifying tube DR1 also is communicated with the end of described filter capacitor C, is specially:
The negative terminal of described the first rectifying tube DR1 connects the end of described filter capacitor C by described filter inductance L.
3. soft switch semi-bridge circuit as claimed in claim 2, is characterized in that, the first link of described former limit winding is communicated with the drain electrode of described second switch pipe Q2, is specially:
The first link of described former limit winding connects the drain electrode of described second switch pipe Q2 by described capacitance Cr.
4. soft switch semi-bridge circuit as claimed in claim 2, is characterized in that, the second link of described former limit winding is communicated with the source electrode of described second switch pipe Q2, is specially:
The second link of described former limit winding connects the source electrode of described second switch pipe Q2 by described capacitance Cr.
5. soft switch semi-bridge circuit as described as claim 1 to 4 any one, is characterized in that, described circuit also comprises the first diode D1 and the second diode D2;
The positive pole of described the first diode D1 connects the source electrode of described the first switching tube Q1, and the negative pole of described the first diode D1 connects the drain electrode of described the first switching tube Q1;
The positive pole of described the second diode D2 connects the source electrode of described second switch pipe Q2, and the negative pole of described the second diode D2 connects the drain electrode of described second switch pipe Q2.
6. soft switch semi-bridge circuit as claimed in claim 5, is characterized in that, described the first switching tube Q1 and described second switch pipe Q2 are insulating gate type field effect tube.
7. soft switch semi-bridge circuit as claimed in claim 6, is characterized in that, described the first rectifying tube DR1 and described the second rectifying tube DR2 are diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203404648U CN203352447U (en) | 2013-06-14 | 2013-06-14 | Soft switch half-bridge circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203404648U CN203352447U (en) | 2013-06-14 | 2013-06-14 | Soft switch half-bridge circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203352447U true CN203352447U (en) | 2013-12-18 |
Family
ID=49752294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203404648U Expired - Lifetime CN203352447U (en) | 2013-06-14 | 2013-06-14 | Soft switch half-bridge circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203352447U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110048496A (en) * | 2019-04-23 | 2019-07-23 | 甘肃南洋新能源科技发展有限公司 | A kind of low-cost wireless method of electric energy transfer and device |
-
2013
- 2013-06-14 CN CN2013203404648U patent/CN203352447U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110048496A (en) * | 2019-04-23 | 2019-07-23 | 甘肃南洋新能源科技发展有限公司 | A kind of low-cost wireless method of electric energy transfer and device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103312171B (en) | Isolated soft switching double tube positive exciting resonance DC/DC circuit | |
| WO2020248472A1 (en) | Asymmetric half-bridge converter and control method therefor | |
| CN105141138B (en) | A kind of voltage-multiplying type Sofe Switch type recommends DC converter | |
| CN202167993U (en) | Phase-shifted full-bridge switching power supply converter with lossless snubber circuit | |
| CN109217681A (en) | A kind of two-way resonance converter | |
| CN103944397A (en) | Boost type isolated DC/DC converter and control method thereof | |
| CN101702578A (en) | Forward-flyback isolated type boost inverter realized by coupling inductors and application thereof | |
| CN106961220B (en) | A kind of efficient LLC resonant converter in parallel with equal properties of flow | |
| CN102570891A (en) | Flyback photovoltaic grid-connected inverter adopting interleaving parallel-connection active clamping technology | |
| CN103904901A (en) | Phase-shift full-bridge converter circuit and control method | |
| CN204578376U (en) | There is the LLC resonant converter of current-limiting function | |
| CN105450030A (en) | Double-transformer variable winding isolated converter and control method thereof | |
| CN203859684U (en) | Large-current half-bridge circuit | |
| CN104638932A (en) | Multi-resonant converter | |
| CN104393762A (en) | DC-DC (direct current to direct current) converter circuit with high step-up ratio based on wireless electric energy transmission | |
| CN205754023U (en) | A kind of high efficiency high-power phase-shifting full-bridge Zero-voltage soft switch circuit | |
| CN109742957A (en) | A kind of bicyclic complex resonance type soft switch transducer | |
| CN201733225U (en) | Separated boost converter for realizing forward-flyback by coupling inductances | |
| CN102739064B (en) | Soft-switch full wave rectifying push-pull normal shock inverter | |
| CN201766503U (en) | Double-end flyback passive and lossless switch power supply topology | |
| CN103762839A (en) | Magnetic coupling type single-phase high-gain bridge-free power factor correction circuit | |
| CN105811789A (en) | High-efficiency and high-power phase-shifted full-bridge zero-voltage soft switching circuit | |
| CN106787756A (en) | A kind of CL FT CL resonance DC converters | |
| CN203352447U (en) | Soft switch half-bridge circuit | |
| CN204906192U (en) | Boost module is recommended to wide region full cut -off ring high efficiency |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131218 |
|
| CX01 | Expiry of patent term |