CN212969446U - Asynchronous BUCK converter and equipment - Google Patents
Asynchronous BUCK converter and equipment Download PDFInfo
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- CN212969446U CN212969446U CN202021800734.5U CN202021800734U CN212969446U CN 212969446 U CN212969446 U CN 212969446U CN 202021800734 U CN202021800734 U CN 202021800734U CN 212969446 U CN212969446 U CN 212969446U
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- diode
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- buck converter
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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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Abstract
The utility model discloses an asynchronous BUCK converter and equipment. The utility model can perform asynchronous rectification by arranging the branch circuit comprising the first diode and the parasitic capacitor, is suitable for asynchronous rectification and can reduce the cost; and by introducing the coupling inductance element comprising the secondary coil, the excitation, the primary coil inductance and the leakage inductance, the current stress of the excitation inductance is low, the voltage stress of the first diode is reduced, and the current stress and the voltage stress of the excitation inductance can be reduced along with the increase of the duty ratio, namely the current stress of the excitation inductance is low and the voltage stress of the first diode is reduced under the condition of large duty ratio, so that the coupling inductance element can be suitable for the occasions with large duty ratio and small required excitation inductance. The utility model relates to a non-synchronous BUCK converter and equipment, but wide application in electric power exchange technical field.
Description
Technical Field
The utility model belongs to the technical field of the power exchange technique and specifically relates to an asynchronous BUCK converter and equipment.
Background
In a BUCK converter, the application of zero voltage soft switching technology can effectively reduce switching losses and improve converter efficiency. Such as quasi-resonant zero voltage, zero voltage transfer soft switching techniques, etc. The conventional buck converter only has the function of synchronously rectifying current, two main switching tubes are required to be arranged in a main circuit as synchronous rectifying tubes, the cost is high, and the buck converter cannot be applied to an asynchronous rectification scene; and the structure is in the current stress of the inductor of the main circuit under the condition of large duty ratio, and the loss is high.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model aims to provide a: an asynchronous BUCK converter and apparatus are provided.
The utility model adopts the technical proposal that: an unsynchronized BUCK converter, comprising: the circuit comprises a coupling inductance element, a first capacitor, a second capacitor, a third capacitor, a parasitic capacitor, a power supply, a first diode, a second diode, a third diode, a first switch tube and a second switch tube, wherein the coupling inductance element comprises a primary coil, a secondary coil, a leakage inductance and an excitation inductance;
a collector of the second switching tube is connected with an anode of the third diode, a cathode of the power supply, a cathode of the first diode and one end of the first capacitor, an emitter of the second switching tube is connected with one end of the secondary coil, the other end of the first capacitor and an anode of the first diode, the other end of the secondary coil is connected with an anode of the power supply, and one end of the secondary coil connected with the second switching tube is a same-name end;
a collector of the first switching tube is connected with an anode of the power supply and a cathode of the second diode, an emitter of the first switching tube is connected with a cathode of the third diode, one end of the leakage inductor and an anode of the second diode, the second capacitor is connected with the second diode in parallel, and the parasitic capacitor is connected with the third diode in parallel;
the other end of the leakage inductor is connected with one end of the excitation inductor and the dotted end of the primary coil, the other end of the excitation inductor is connected with the non-dotted end of the primary coil and one end of a third capacitor, the other end of the third capacitor is connected with the anode of a third diode, and the third capacitor is used for being connected with a load in parallel.
The utility model also provides an equipment, include asynchronous BUCK converter with the load.
The utility model has the advantages that: by arranging the branch circuit comprising the first diode and the parasitic capacitor, asynchronous rectification can be performed, and the method is suitable for asynchronous rectification and can reduce the cost; and by introducing the coupling inductance element comprising the secondary coil, the excitation, the primary coil inductance and the leakage inductance, the current stress of the excitation inductance is low, the voltage stress of the first diode is reduced, and the current stress and the voltage stress of the excitation inductance can be reduced along with the increase of the duty ratio, namely the current stress of the excitation inductance is low and the voltage stress of the first diode is reduced under the condition of large duty ratio, so that the coupling inductance element can be suitable for the occasions with large duty ratio and small required excitation inductance.
Drawings
FIG. 1 is a schematic diagram of an asynchronous BUCK converter according to the present invention;
fig. 2 is a schematic diagram illustrating parameter changes in the operating process of an asynchronous BUCK converter according to the present invention.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first," "second," "third," and the like in the description and claims of this application and in the drawings are used solely to distinguish one from another and are not used to describe a particular sequence. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The invention will be further explained and explained with reference to the drawings and the embodiments in the following description.
Referring to fig. 1, an embodiment of the present invention provides an asynchronous BUCK converter suitable for a small excitation inductor current and a large duty ratio, which includes a coupling inductor element, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a parasitic capacitor CD3Power supply VinA first diode D1, a second diode D2, a third diode D3, a first switch tube S1And a second switching tube S11Wherein the coupled inductive element comprises a primary winding N1Secondary winding N2Leakage inductance LrAnd an excitation inductance Lm；
The second switch tube S11Is connected to the anode of the third diode D3 and the power source VinThe negative pole of the first diode D1 and one end of the first capacitor C1, the second switch tube S11Is connected with the secondary side coil N2One end, the other end of the first capacitor C1 and the anode of the first diode D1, and the secondary winding N2The other end is connected with the power supply VinWherein the secondary winding N2And the second switch tube S11One end of the connection is a homonymous end;
the first switch tube S1Collector electrode of is connected with the power supply VinAnd a cathode of the second diode D2, and the first switching tube S1Is connected with the cathode of the third diode D3 and the leakage inductance LrOne end and the anode of the second diode D2, the second capacitor C2 is connected in parallel with the second diode D2, and the parasitic capacitor CD3Is connected in parallel with the third diode D3;
the leakage inductance LrThe other end is connected with the excitation inductor LmOne end and the primary coil N1Said excitation inductance LmThe other end is connected with the primary coil N1And one end of the third capacitor C3, the other end of the third capacitor C3 being connected to the anode of the third diode D3, and the third capacitor C3 being configured to be connected in parallel to the load R.
In the present embodiment, it can be understood that the pulse control signal S1And S11Not limited to the form shown in fig. 2, other ways may be utilized in other embodiments;
indicating the time that S11 was previously turned on before S1, including but not limited to the length shown in the figure.
The following detailed description describes the specific working process of the present invention:
t1～t2at t1Before time, S1And S11In the on state, S11The branch is conducted, the current i of the branch isDReduced, but leakage inductance LrCurrent iLrIncrease until at t1The branch current iD is zero at the moment, so that the zero-current soft switch is turned off S11. Voltage V across the third diodeD1And a leakage inductance voltage VLrIs zero. At t1～t2，Lr、LmQuilt Vin-VoutCharging due to LmLarge, exciting inductance voltage
Is approximately Vin-Vout。
t2～t3At t2At time, turn off S1，S1Via a second capacitor
(flow through S)1Current of the branch), S1Voltage between collector and emitter stages of
Parasitic capacitance C of non-synchronous rectifier diode (third diode) increased from zeroD3Current through the third diode
And (4) discharging.
t3～t4At t3At that time, the third diode is turned on, S1Voltage between collector and emitter stages of
Increasing, in particular to vin，Lm、LrAnd (4) discharging.
t4～t5At t4Time of day, S11Conducting and exciting inductive current iLmDecrease of Lm＝Is clamped at-vin/N，iD1、
Is reduced and iDIncrease of S1Realize the zero-voltage soft switch on and meet
Where N refers to the ratio of the secondary winding to the primary winding.
t5～t6At t5Time, iD1The decrease is zero and the third diode is turned off in the reverse direction. L isr、CD3C2 resonance, parasitic capacitance C of D3D3Via a
Charging, C2 via
Discharge, S1Voltage between collector and emitter stages of
The linearity decreases. The resonance formula is as follows:
where t represents the time, which is the algebraic sum of the parasitic capacitance CD1 and the second capacitance.
t6～t7At t6At the moment of time, the time of day,
the linear decrease is zero and the linear decrease is zero,
flow through D2, thereby ensuring S1The zero voltage soft switch is turned on. The voltage of the excitation inductor
Leakage inductance current and
increase of iDDecrease, now satisfy
t7～t8At t7At the moment of time, the time of day,
increase to zero, S1The current of (1) is changed from negative to positive iDDecreasing to 0 and the entire switching cycle ends.
The utility model also provides an equipment, include asynchronous BUCK converter with load R.
The utility model discloses can be applied to asynchronous rectification BUCK converter, add an auxiliary secondary winding N2And auxiliary controllable S11Forming auxiliary circuits to realize pairs S of coupled inductive elements1And S11Soft switch, first switching tube S1The first diode has low voltage stress and is turned on when required11In time, can advance
Control S11The current average is reduced and turned on. In addition, one of the switching tubes of the main circuit of the existing exchanger is replaced by the D3, so that the cost is reduced, and the method is suitable for the occasion of asynchronous rectification.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (2)
1. An asynchronous BUCK converter, comprising: the circuit comprises a coupling inductance element, a first capacitor, a second capacitor, a third capacitor, a parasitic capacitor, a power supply, a first diode, a second diode, a third diode, a first switch tube and a second switch tube, wherein the coupling inductance element comprises a primary coil, a secondary coil, a leakage inductance and an excitation inductance;
a collector of the second switching tube is connected with an anode of the third diode, a cathode of the power supply, a cathode of the first diode and one end of the first capacitor, an emitter of the second switching tube is connected with one end of the secondary coil, the other end of the first capacitor and an anode of the first diode, the other end of the secondary coil is connected with an anode of the power supply, and one end of the secondary coil connected with the second switching tube is a same-name end;
a collector of the first switching tube is connected with an anode of the power supply and a cathode of the second diode, an emitter of the first switching tube is connected with a cathode of the third diode, one end of the leakage inductor and an anode of the second diode, the second capacitor is connected with the second diode in parallel, and the parasitic capacitor is connected with the third diode in parallel;
the other end of the leakage inductor is connected with one end of the excitation inductor and the dotted end of the primary coil, the other end of the excitation inductor is connected with the non-dotted end of the primary coil and one end of a third capacitor, the other end of the third capacitor is connected with the anode of a third diode, and the third capacitor is used for being connected with a load in parallel.
2. An apparatus, characterized by: comprising the asynchronous BUCK converter and the load according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021800734.5U CN212969446U (en) | 2020-08-25 | 2020-08-25 | Asynchronous BUCK converter and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021800734.5U CN212969446U (en) | 2020-08-25 | 2020-08-25 | Asynchronous BUCK converter and equipment |
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| Publication Number | Publication Date |
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| CN212969446U true CN212969446U (en) | 2021-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021800734.5U Active CN212969446U (en) | 2020-08-25 | 2020-08-25 | Asynchronous BUCK converter and equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115833610A (en) * | 2023-02-09 | 2023-03-21 | 恩赛半导体(成都)有限公司 | Power supply conversion circuit and electronic device |
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2020
- 2020-08-25 CN CN202021800734.5U patent/CN212969446U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115833610A (en) * | 2023-02-09 | 2023-03-21 | 恩赛半导体(成都)有限公司 | Power supply conversion circuit and electronic device |
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