CN202424493U - Driving circuit of liquid level control (LLC) half-bridge resonant converter - Google Patents
Driving circuit of liquid level control (LLC) half-bridge resonant converter Download PDFInfo
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- CN202424493U CN202424493U CN2012200152068U CN201220015206U CN202424493U CN 202424493 U CN202424493 U CN 202424493U CN 2012200152068 U CN2012200152068 U CN 2012200152068U CN 201220015206 U CN201220015206 U CN 201220015206U CN 202424493 U CN202424493 U CN 202424493U
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- switching tube
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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Abstract
The utility model discloses a driving circuit of a liquid level control (LLC) half-bridge resonant converter, which comprises an upper switch tube driving circuit and a lower switch tube driving circuit. The upper switch tube driving circuit comprises a first auxiliary side winding, a first opening loop and a first accelerated closing loop, wherein a dotted terminal of the first auxiliary side winding is connected with a control pole of an upper switch tube through the first opening loop, a non-dotted terminal of the first auxiliary side winding is connected with an output end of the upper switch tube, and the control pole of the upper switch tube is connected with the output end of the upper switch tube through the first accelerated closing loop. The structure of the lower switch tube driving circuit is identical to that of the upper switch tube driving circuit. The driving circuit of the LLC half-bridge resonant converter can avoid losing of connection duty ratio of the resonant converter and ensures that the LLC half-bridge resonant converter is in a soft switching state.
Description
[technical field]
The utility model relates to the LLC half bridge resonant transformer, relates in particular to a kind of drive circuit of LLC half bridge resonant transformer.
[background technology]
There is the problem of duty-cycle loss in traditional LLC half bridge resonant transformer, and duty-cycle loss causes Dead Time to become big, and Dead Time is excessive, and the LLC half bridge resonant transformer just possibly be operated in the hard switching state, rather than soft on off state.
[summary of the invention]
The technical problem that the utility model will solve provides a kind of drive circuit that can not produce the LLC half bridge resonant transformer of conducting duty-cycle loss.
In order to solve the problems of the technologies described above; The technical scheme that the utility model adopts is; A kind of drive circuit of LLC half bridge resonant transformer; Described half bridge resonant transformer comprises switching tube and following switching tube, and described drive circuit comprises isolating transformer, goes up switching tube drive circuit and following switching tube drive circuit, and described isolating transformer comprises the first secondary winding and the second secondary winding; The described switching tube drive circuit of going up comprises that the described first secondary winding, first opens loop and first and quicken turn-off circuit; The end of the same name of the first secondary winding is opened the control utmost point that the loop connects switching tube through first; Output end of switching tube on the different name termination of the first secondary winding, the control utmost point of last switching tube quickens turn-off circuit through first and connects output end of switching tube; Described down switching tube drive circuit comprises that the described second secondary winding, second opens loop and second and quicken turn-off circuit; The different name end of the second secondary winding is opened the control utmost point that the loop connects down switching tube through second; Output end of switching tube under the termination of the same name of the second secondary winding, the control utmost point of following switching tube quickens turn-off circuit through second and connects down output end of switching tube.
The drive circuit of above-described LLC half bridge resonant transformer, described first quickens turn-off circuit comprises a PNP triode, first diode and first base resistance; The emitter of the one PNP triode connects the control utmost point of switching tube, the end of the same name of first termination, the first secondary winding of first base resistance, the base stage of second termination the one PNP triode; The collector electrode of the one PNP triode connects the anode of first diode, and the negative electrode of first diode connects output end of switching tube; Described second quickens turn-off circuit comprises the 2nd PNP triode, second diode and base resistance; The emitter of the 2nd PNP triode connects down the control utmost point of switching tube; The different name end of first termination, the second secondary winding of second base resistance, the base stage of second termination the 2nd PNP triode; The collector electrode of the 2nd PNP triode connects the anode of second diode, and the negative electrode of second diode connects down output end of switching tube.
The drive circuit of above-described LLC half bridge resonant transformer, described first quickens turn-off circuit comprises that first turn-offs driving resistor, the collector electrode of a PNP triode turn-offs the anode that driving resistor connects first diode through first; Described second quickens turn-off circuit comprises that second turn-offs driving resistor, and the collector electrode of the 2nd PNP triode turn-offs the anode that driving resistor connects second diode through second.
The drive circuit of above-described LLC half bridge resonant transformer, described first opens the loop comprises that first opens driving resistor, and said first opens the end of the same name of a termination first secondary winding of driving resistor, and the other end connects the control utmost point of switching tube; Described second opens the loop comprises that second opens driving resistor, and said second opens the different name end of a termination second secondary winding of driving resistor, the control utmost point of switching tube under another termination.
The drive circuit of above-described LLC half bridge resonant transformer, the positive pole of the input termination input power supply of last switching tube, last output end of switching tube connects down the input of switching tube, following output end of switching tube ground connection.
The drive circuit of the utility model LLC half bridge resonant transformer can prevent losing of controlled resonant converter conducting duty ratio, guarantees that controlled resonant converter is in soft on off state.
[description of drawings]
Below in conjunction with accompanying drawing and embodiment the utility model is done further detailed explanation.
Fig. 1 is the drive circuit embodiment schematic diagram of the utility model LLC half bridge resonant transformer.
[embodiment]
In the embodiment of the drive circuit of the utility model LLC half bridge resonant transformer shown in Figure 1, half bridge resonant transformer comprises switching tube Q1, switching tube Q3, output amplifier T2, resonant inductance L1, capacitance C1 and storage capacitor C2 down.The positive pole of the input termination pfc circuit output of last switching tube Q1, the input of switching tube Q3 under the output termination of last switching tube Q1, the output head grounding of following switching tube Q3.Storage capacitor C2 is connected between the tie point and ground of switching tube Q1 output and following switching tube Q3 input.After the primary coil of output amplifier T2, resonant inductance L1 and the capacitance C1 serial connection, the tie point of switching tube Q1 output and following switching tube Q3 input on the termination, other end ground connection.
Drive circuit comprises isolating transformer T1, goes up switching tube Q1 drive circuit and following switching tube Q3 drive circuit.
Isolating transformer T1 comprises the first secondary winding N2 and the second secondary winding N3.
Last switching tube Q1 drive circuit comprises that the first secondary winding N2, first opens loop and first and quickens turn-off circuit; The end of the same name of the first secondary winding N2 is opened the control utmost point that the loop connects switching tube Q1 through first; The output of switching tube Q1 on the different name termination of the first secondary winding N2, the control utmost point of last switching tube Q1 quickens the output that turn-off circuit connects switching tube Q1 through first.Following switching tube Q3 drive circuit comprises that the second secondary winding N3, second opens loop and second and quickens turn-off circuit; The different name end of the second secondary winding N3 is opened the control utmost point that the loop meets down switching tube Q3 through second; The output of switching tube Q3 under the termination of the same name of the second secondary winding N3, the control utmost point of following switching tube Q3 quickens the output that turn-off circuit meets down switching tube Q3 through second.
First quickens turn-off circuit comprises a PNP triode Q2, the first diode D1 and the first base resistance R2.The emitter of the one PNP triode Q2 connects the control utmost point of switching tube Q1, the end of the same name of first termination, the first secondary winding N2 of the first base resistance R2, the base stage of second termination the one PNP triode Q2.The collector electrode of the one PNP triode Q2 turn-offs the anode that driving resistor R3 meets the first diode D1 through first, and the negative electrode of the first diode D1 connects the output of switching tube Q1.Second quickens turn-off circuit comprises the 2nd PNP triode Q4, second diode D2 and the base resistance; The emitter of the 2nd PNP triode Q4 connects down the control utmost point of switching tube Q 3; The different name end of first termination, the second secondary winding N3 of the second base resistance R5, the base stage of second termination the 2nd PNP triode Q4.The collector electrode of the 2nd PNP triode Q4 turn-offs the anode that driving resistor R6 meets the second diode D2 through second, and the negative electrode of the second diode D2 connects down the output of switching tube Q 3.
First opens the loop comprises that first opens driving resistor R1, and first opens the end of the same name of a termination first secondary winding N2 of driving resistor R1, and the other end connects the control utmost point of switching tube Q1.Second opens the loop comprises that second opens driving resistor R4, and second opens the different name end of a termination second secondary winding N3 of driving resistor R4, the control utmost point of switching tube Q 3 under another termination.
The elementary pulse signal of the former limit of isolating transformer T1 winding removes driving power switch mosfet pipe Q1 and Q3 through the high-frequency pulse transformer coupling; When elementary pulse voltage is correct time, the last switching tube Q1 conducting of half-bridge converter, Q2 during this period; D1 ends, and is not worked by its leadage circuit that constitutes.When elementary pulse voltage is zero, Q2 then, the D1 conducting, the MOSFET grid of releasing fast (the control utmost point) electric charge quickens ending of MOSFET.When elementary pulse voltage when negative, Q2, D1 ends.If there is not diode D1, when elementary pulse voltage is negative, the CB utmost point positively biased conducting of Q2, thus making the conducting of the CE utmost point, next elementary pulse is correct time, because the storage effect of triode, triode Q2 can not end rapidly, causes losing of conducting duty ratio.Because the existence of diode D1, when elementary pulse voltage when negative, D1 instead ends partially, stops the CB utmost point conducting of triode Q2, Q 2 has been in cut-off state before next positive pulse arrives, can prevent losing of conducting duty ratio.The following pipe of half-bridge converter and the operation principle of drive circuit thereof are identical.
Claims (5)
1. the drive circuit of a LLC half bridge resonant transformer; It is characterized in that; Described half bridge resonant transformer comprises switching tube and following switching tube; Described drive circuit comprises isolating transformer, goes up switching tube drive circuit and following switching tube drive circuit, and described isolating transformer comprises the first secondary winding and the second secondary winding; The described switching tube drive circuit of going up comprises that the described first secondary winding, first opens loop and first and quicken turn-off circuit; The end of the same name of the first secondary winding is opened the control utmost point that the loop connects switching tube through first; Output end of switching tube on the different name termination of the first secondary winding, the control utmost point of last switching tube quickens turn-off circuit through first and connects output end of switching tube; Described down switching tube drive circuit comprises that the described second secondary winding, second opens loop and second and quicken turn-off circuit; The different name end of the second secondary winding is opened the control utmost point that the loop connects down switching tube through second; Output end of switching tube under the termination of the same name of the second secondary winding, the control utmost point of following switching tube quickens turn-off circuit through second and connects down output end of switching tube.
2. the drive circuit of LLC half bridge resonant transformer according to claim 1 is characterized in that, described first quickens turn-off circuit comprises a PNP triode, first diode and first base resistance; The emitter of the one PNP triode connects the control utmost point of switching tube, the end of the same name of first termination, the first secondary winding of first base resistance, the base stage of second termination the one PNP triode; The collector electrode of the one PNP triode connects the anode of first diode, and the negative electrode of first diode connects output end of switching tube; Described second quickens turn-off circuit comprises the 2nd PNP triode, second diode and base resistance; The emitter of the 2nd PNP triode connects down the control utmost point of switching tube; The different name end of first termination, the second secondary winding of second base resistance, the base stage of second termination the 2nd PNP triode; The collector electrode of the 2nd PNP triode connects the anode of second diode, and the negative electrode of second diode connects down output end of switching tube.
3. the drive circuit of LLC half bridge resonant transformer according to claim 2; It is characterized in that; Described first quickens turn-off circuit comprises that first turn-offs driving resistor, and the collector electrode of a PNP triode turn-offs the anode that driving resistor connects first diode through first; Described second quickens turn-off circuit comprises that second turn-offs driving resistor, and the collector electrode of the 2nd PNP triode turn-offs the anode that driving resistor connects second diode through second.
4. the drive circuit of LLC half bridge resonant transformer according to claim 1; It is characterized in that; Described first opens the loop comprises that first opens driving resistor, and said first opens the end of the same name of a termination first secondary winding of driving resistor, and the other end connects the control utmost point of switching tube; Described second opens the loop comprises that second opens driving resistor, and said second opens the different name end of a termination second secondary winding of driving resistor, the control utmost point of switching tube under another termination.
5. the drive circuit of LLC half bridge resonant transformer according to claim 1 is characterized in that, the positive pole of the input termination input power supply of last switching tube, and last output end of switching tube connects down the input of switching tube, following output end of switching tube ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200152068U CN202424493U (en) | 2012-01-13 | 2012-01-13 | Driving circuit of liquid level control (LLC) half-bridge resonant converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200152068U CN202424493U (en) | 2012-01-13 | 2012-01-13 | Driving circuit of liquid level control (LLC) half-bridge resonant converter |
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| Publication Number | Publication Date |
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| CN202424493U true CN202424493U (en) | 2012-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200152068U Expired - Fee Related CN202424493U (en) | 2012-01-13 | 2012-01-13 | Driving circuit of liquid level control (LLC) half-bridge resonant converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103138541A (en) * | 2012-11-29 | 2013-06-05 | 深圳市航嘉驰源电气股份有限公司 | Drive transformer isolation self-adaptation drive circuit |
| CN103474214A (en) * | 2013-09-24 | 2013-12-25 | 中国船舶重工集团公司第七二三研究所 | Pulse isolation transformer |
| CN107707125A (en) * | 2017-10-20 | 2018-02-16 | 四川莱福德科技有限公司 | Drive circuit and bridge-type resonance circuit |
-
2012
- 2012-01-13 CN CN2012200152068U patent/CN202424493U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103138541A (en) * | 2012-11-29 | 2013-06-05 | 深圳市航嘉驰源电气股份有限公司 | Drive transformer isolation self-adaptation drive circuit |
| WO2014082255A1 (en) * | 2012-11-29 | 2014-06-05 | 深圳市航嘉驰源电气股份有限公司 | Isolation self-adaptive drive circuit for drive transformer |
| CN103138541B (en) * | 2012-11-29 | 2015-05-06 | 深圳市航嘉驰源电气股份有限公司 | Drive transformer isolation self-adaptation drive circuit |
| CN103474214A (en) * | 2013-09-24 | 2013-12-25 | 中国船舶重工集团公司第七二三研究所 | Pulse isolation transformer |
| CN107707125A (en) * | 2017-10-20 | 2018-02-16 | 四川莱福德科技有限公司 | Drive circuit and bridge-type resonance circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120905 Termination date: 20200113 |
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| CF01 | Termination of patent right due to non-payment of annual fee |