CN213185885U - Asynchronous full-load soft switching BUCK converter, circuit and equipment - Google Patents
Asynchronous full-load soft switching BUCK converter, circuit and equipment Download PDFInfo
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- CN213185885U CN213185885U CN202021821983.2U CN202021821983U CN213185885U CN 213185885 U CN213185885 U CN 213185885U CN 202021821983 U CN202021821983 U CN 202021821983U CN 213185885 U CN213185885 U CN 213185885U
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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 a soft switching BUCK converter, circuit and equipment of asynchronous full load. The utility model discloses an auxiliary circuit that secondary winding, second switch tube, third triode and third electric capacity formed makes auxiliary circuit can control, can control the second switch tube in advance when the first switch tube that needs to control as the main switch tube is opened, reaches controllable purpose; by introducing the first diode and the parasitic capacitor, asynchronous rectification can be realized, and the cost is reduced; the parasitic capacitance and the leakage inductance for resonance and the position of the second capacitor C2 enable the influence of the input voltage of the power supply and the current of the load on the resonance process of the circuit to be small, soft switching of the full load is achieved, and the full-load soft switching circuit can be widely applied to the technical field of power switching.
Description
Technical Field
The utility model belongs to the technical field of the electric power switching technique and specifically relates to asynchronous full load soft switching BUCK converter, circuit and equipment.
Background
In a BUCK converter, the application of zero voltage soft switching technology can effectively reduce switching losses and improve converter efficiency. The BUCK converter needs to rectify current in some application scenes, but some BUCK converters in the prior art only have a synchronous rectification function, and because the auxiliary circuit of the BUCK converter is uncontrollable, two main switching tubes are required to be used as synchronous rectification tubes in a main circuit to provide a loop for reverse current of the BUCK converter, so that the cost is high; on the other hand, the input voltage and the load current have great influence on the resonance process, and the buck converter in the full load range cannot be realized.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model aims to provide a: an asynchronous full-load soft-switching BUCK converter, circuit and device are provided.
The utility model adopts the technical proposal that: the asynchronous full-load soft switching BUCK converter comprises a coupling inductance element, a first capacitor, a first unit, a second unit, a first diode, a parasitic capacitor and a power supply;
the coupling inductance element comprises an excitation inductance, a leakage inductance, a primary coil and a secondary coil, the excitation inductance is connected with the primary coil in parallel, one end of the leakage inductance is connected with the negative electrode of the first diode, the second end of the second unit and one end of the secondary coil, the other end of the leakage inductance is connected with one end of the excitation inductance, the other end of the excitation inductance is connected with one end of the first capacitor, the other end of the first capacitor is connected with the negative electrode of the power supply, and the first capacitor is used for being connected with a load in parallel;
the anode of the first diode is connected with the cathode of the power supply, and the parasitic capacitor is connected with the first diode in parallel;
the other end of the secondary coil is connected with the second end of the first unit, one end of the secondary coil connected with the first unit and one end of the primary coil connected with the leakage inductor are homonymous ends;
the first end of the second unit is connected with the positive electrode of the power supply, the second unit comprises a first switch tube, a second diode and a second capacitor, the second capacitor is connected with the second diode in parallel, the positive electrode of the second diode is connected with the emitting electrode of the first switch tube, the negative electrode of the second diode is connected with the collector electrode of the first switch tube, the collector electrode of the first switch tube is used as the first end of the second unit, and the emitting electrode of the first switch tube is used as the second end of the second unit;
the first end of the first unit is connected with the negative electrode of the power supply, the first unit comprises a second switch tube, a third diode and a third capacitor, the third capacitor is connected with the third diode in parallel, the positive electrode of the third diode is connected with the emitting electrode of the second switch tube, the negative electrode of the third diode is connected with the collecting electrode of the second switch tube, the collecting electrode of the second switch tube is used as the first end of the first unit, and the emitting electrode of the second switch tube is used as the second end of the first unit.
Further, the power supply is a direct current power supply.
The utility model also provides a circuit, include asynchronous full load soft switching BUCK converter and the load.
The utility model also provides an equipment, include the circuit.
The utility model has the advantages that: the auxiliary circuit is controlled by the auxiliary side coil, the second switch tube, the third triode and the third capacitor, and the second switch tube can be controlled in advance when the first switch tube serving as the main switch tube needs to be controlled to be opened, so that the aim of controllability is fulfilled; by introducing the first diode and the parasitic capacitor, asynchronous rectification can be realized, and the cost is reduced; and the parasitic capacitance, the leakage inductance and the second capacitance for resonance are arranged, so that the influence of the input voltage of the power supply and the current of the load on the resonance process of the circuit is small, and the soft switching of the full load is realized.
Drawings
FIG. 1 is a schematic diagram of an asynchronous full load soft switching BUCK converter of the present invention;
fig. 2 is a parameter variation diagram of the asynchronous full-load soft-switching 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 full-load soft-switching BUCK converter, which includes a coupling inductor, a first capacitor C1, a first unit a, a second unit B, a first diode D1, a parasitic capacitor CD1, and a power supply Vin；
The coupling inductance element comprises an excitation inductance LmLeakage inductance LrPrimary side coil N1And secondary winding N2Said excitation inductance LmAnd the primary coil N1In parallel, the leakage inductance LrOne end of the first diode D1, the second end of the second unit B and the secondary coil N2One end of the leakage inductor Lr is connected with the excitation inductor L at the other endmSaid excitation inductance LmThe other end of the first capacitor C1 is connected with one end of the first capacitor C1, and the other end of the first capacitor C1 is connected with the power supply VinThe first capacitor C1 is used for being connected in parallel with a load R;
the anode of the first diode D1 is connected with the cathode of the power Vin, and the parasitic capacitor CD1Is connected with the first diode D1 in parallel;
the secondary side coil N2The other end is connected with the second end of the first unit A, and the secondary coil N2One end connected with the first unit A and the primary coil N1Connecting the leakage inductance LrOne end of (A) is a homonymous end, N2:N1＝N；
The first end of the second unit B is connected with the power supply VinThe second unit B comprises a first switch tube S1, a second diode D2 and a second capacitor C2, the second capacitor C2 is connected in parallel with the second diode D2, and the anode of the second diode D2 is connected to the first switch tube S1The cathode of the second diode D2 is connected to the first switch tube S1The first switch tube S1As a first end of the second unit B, the first switching tube S1As a second terminal of the second cell B;
the first end of the first unit A is connected with the power supply VinThe first unit A comprises a second switch tube S11A third diode D3 and a third capacitor C3, the third capacitor C3 is connected in parallel with the third diode D3, and the anode of the third diode D3 is connected to the second switch tube S11The cathode of the third diode D3 is connected to the second switching tube S11The collector electrode of (1), the second switching tubeS11As a first end of the first unit a, the second switching tube S11As a second terminal of the first cell a.
Optionally, the pulse signal S of fig. 2 corresponds to the first switch tube1Corresponding to the pulse signal S of the second switch tube11For the purpose of illustration, the present invention can realize one of the pulse signal modes of the function, which can be adjusted according to the actual situation without limitation;
is shown at S1Before turn on S11Time of (d).
The following detailed description describes the specific working process of the present invention:
(1)(t1～t2) At t1Before the moment, the first switch tube S1Conducting, auxiliary circuit (i.e. S)11And N2Branch) of the second switching tube S11Conduction, conduction of auxiliary circuit, auxiliary circuit current iDReduced leakage current iLrIncrease at t1Time auxiliary circuit current iDReduced to zero, leakage inductance voltage VLrReduced to zero, the second switch tube S in the auxiliary circuit11The zero current soft switch is turned off. At this stage, the leakage inductance LrAnd an excitation inductor LmQuilt Vin-VoutCharging due to LmLarge voltage of exciting inductor
Is approximately Vin-Vout(ii) a The voltage V across the first diode D1D1Is zero.
(2)(t2～t3) At t2At the moment, the first switch tube S1Off, S1Via a current through a parallel capacitor second capacitor C2
Charging, the first switch tube S1Voltage of collector-emitter stage
Linearly increasing from zero, non-synchronous rectifier diode (i.e., first diode D1) D1Parasitic capacitance C ofD1Via (current of the first diode D1)
And (4) discharging.
(3)(t3～t4) At t3At the moment, the first switch tube S1Voltage of collector-emitter stage
Linear increase to vinAsynchronous rectifier diode D1Conducting and exciting inductor LmAnd leakage inductance LrAt-voutIs discharged under the action of the electric current.
(4)(t4～t5) At t4At any moment, the second switching tube S of the auxiliary series circuit11Turning on, clamping exciting inductance voltage at 0V, and assisting current i of series circuitDEnlarged, non-synchronous rectifier diode D1Current of branch iD1The number of the grooves is reduced, and the,
/(exciting inductor current i)Lm) Reduced at this stage to facilitate the first switching tube S1The zero voltage soft switch of (1) is turned on, optionally requiring N > 0.
(5)(t5～t6) At t5Time of day, non-synchronous rectifier diode D1Current of branch iD1Reduced to zero, diode D1And cutting off in the reverse direction. Leakage inductance L at this stagerParasitic capacitance C of the first diode D1D1A first switch tube S1The second capacitor C2, the parasitic capacitor C of the first diode D1D1Via a
Charging, the first switch tube S1Second capacitor C2Via a
Discharge, first switching tube S1Voltage of collector-emitter stage
The linearity decreases. The formula of resonance:
wherein, CSIs a parasitic capacitance CD1And the algebraic sum of the second capacitances, t representing the time instant.
(6)(t6～t7) At t6At the moment, the first switch tube S1Voltage of collector-emitter stage
Linear decrease to zero, current
Via a first switch tube S1The anti-parallel second diode D2 continues to flow, thereby ensuring the first switch tube S1The zero voltage soft switch is turned on. At this stage, exciting the inductive voltage
The size of the mixture is increased, and the mixture is,
increasing, assisting the current i of the series circuitDThe reduction is, optionally,
(7)(t7～t8) At t7Time of day, current
Increase to zero, the first switch tube S1Is changed from negative to positive, and assists the current i of the series circuitDThe decrease is zero and the entire switching cycle is over.
The utility model discloses an added an auxiliary winding and supplementary controllable type switch tube simply and formed coupling inductance zero voltage soft switch and be applied to asynchronous rectification BUCK converter, replaced a switch tube of main circuit among the current synchronous rectification BUCK converter with first diode D1, realize main switch tube and supplementary controllable type switch tube and realize soft switch, realize that zero voltage opens, zero current turn-offs, there is not the reverse recovery problem, auxiliary circuit' S second switch tube S11The first switch tube S can be kept in the off state for most of the time1Before opening, advance
The average value of the current of the auxiliary circuit can be effectively reduced, the conduction loss of the auxiliary circuit is reduced, the efficiency of the converter is improved, the cost is further reduced by replacing a switching tube with the first diode D1, and the BUCK converter is particularly suitable for occasions with asynchronous rectification and high requirements on soft switching.
The utility model discloses still provide the circuit, including above-mentioned BUCK converter and load.
The utility model discloses still provide equipment, including above-mentioned circuit.
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 (4)
1. An asynchronous full load soft switching BUCK converter, comprising: the circuit comprises a coupling inductance element, a first capacitor, a first unit, a second unit, a first diode, a parasitic capacitor and a power supply;
the coupling inductance element comprises an excitation inductance, a leakage inductance, a primary coil and a secondary coil, the excitation inductance is connected with the primary coil in parallel, one end of the leakage inductance is connected with the negative electrode of the first diode, the second end of the second unit and one end of the secondary coil, the other end of the leakage inductance is connected with one end of the excitation inductance, the other end of the excitation inductance is connected with one end of the first capacitor, the other end of the first capacitor is connected with the negative electrode of the power supply, and the first capacitor is used for being connected with a load in parallel;
the anode of the first diode is connected with the cathode of the power supply, and the parasitic capacitor is connected with the first diode in parallel;
the other end of the secondary coil is connected with the second end of the first unit, one end of the secondary coil connected with the first unit and one end of the primary coil connected with the leakage inductor are homonymous ends;
the first end of the second unit is connected with the positive electrode of the power supply, the second unit comprises a first switch tube, a second diode and a second capacitor, the second capacitor is connected with the second diode in parallel, the positive electrode of the second diode is connected with the emitting electrode of the first switch tube, the negative electrode of the second diode is connected with the collector electrode of the first switch tube, the collector electrode of the first switch tube is used as the first end of the second unit, and the emitting electrode of the first switch tube is used as the second end of the second unit;
the first end of the first unit is connected with the negative electrode of the power supply, the first unit comprises a second switch tube, a third diode and a third capacitor, the third capacitor is connected with the third diode in parallel, the positive electrode of the third diode is connected with the emitting electrode of the second switch tube, the negative electrode of the third diode is connected with the collecting electrode of the second switch tube, the collecting electrode of the second switch tube is used as the first end of the first unit, and the emitting electrode of the second switch tube is used as the second end of the first unit.
2. The BUCK converter according to claim 1, wherein: the power supply is a direct current power supply.
3. A circuit, characterized by: comprising the asynchronous full load soft switching BUCK converter as claimed in claim 1 or 2 and said load.
4. An apparatus, characterized by: comprising a circuit as claimed in claim 3.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021821983.2U CN213185885U (en) | 2020-08-27 | 2020-08-27 | Asynchronous full-load soft switching BUCK converter, circuit and equipment |
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| CN202021821983.2U CN213185885U (en) | 2020-08-27 | 2020-08-27 | Asynchronous full-load soft switching BUCK converter, circuit and equipment |
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| CN213185885U true CN213185885U (en) | 2021-05-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023125781A1 (en) * | 2021-12-31 | 2023-07-06 | 中兴通讯股份有限公司 | Soft switch circuit and control method therefor, and power source assembly |
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- 2020-08-27 CN CN202021821983.2U patent/CN213185885U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023125781A1 (en) * | 2021-12-31 | 2023-07-06 | 中兴通讯股份有限公司 | Soft switch circuit and control method therefor, and power source assembly |
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