CN204538968U - A kind of ZVT-PWMBUCK circuit of improvement - Google Patents
A kind of ZVT-PWMBUCK circuit of improvement Download PDFInfo
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- CN204538968U CN204538968U CN201520155250.2U CN201520155250U CN204538968U CN 204538968 U CN204538968 U CN 204538968U CN 201520155250 U CN201520155250 U CN 201520155250U CN 204538968 U CN204538968 U CN 204538968U
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Abstract
The utility model relates to a kind of BUCK circuit, especially a kind of ZVT-PWMBUCK circuit of improvement.It comprises main switch, auxiliary switch, buffer capacitor; The drain electrode that the drain electrode of main switch connects auxiliary switch and positive source, drain electrode to be also connected the source electrode of main switch respectively by main switch shunt capacitance with the 3rd diode, source electrode passes through the first inductance successively and the first resistance connects power cathode, source electrode and also passes through the 5th diode and connect power cathode, the source electrode bifurcation road of auxiliary switch, a branch road to be connected the negative pole of the 5th diode by resonant inductance successively with the second diode, another branch road is connected power cathode by the 4th diode with the first diode successively; Between the positive pole that the positive pole of one end connection the 5th diode of buffer capacitor, the other end are connected to the 4th diode and the negative pole of the first diode.The present embodiment improves on the basis of conventional circuit structure, and the near zero voltage realizing auxiliary switch turns off, and reduces loss when auxiliary switch turns off.
Description
Technical field
The utility model relates to a kind of BUCK circuit, especially a kind of ZVT-PWMBUCK circuit of improvement.
Background technology
Buck (BUCK) converter is one of topology comparatively commonly used, and its output voltage is equal to or less than input voltage, and is a kind of single tube non-isolated DC converter.Switching tube, diode, output filter capacitor and output inductor constitute its main circuit.
It is a lot of that BUCK converter circuit realizes the method that no-voltage opens, but using at present is ZVT-PWMBUCK circuit comparatively widely, the feature of this circuit utilizes resonant inductance and main switch shunt capacitance, resonance makes main switch both end voltage drop to zero before main switch is opened, backward diode in the body simultaneously flowing through main switch due to resonance current, thus main switch to be zero-voltage zero-current open-minded.Its advantage is that main switch and auxiliary switch electric current and voltage stress are little, and main switch no-voltage opens easy realization; And the state of its major defect to be auxiliary tube be operated in hard switching, turn-off power loss is comparatively large, even may be also larger than the turn-off power loss of main switch when not adding auxiliary circuit.
Utility model content
For above-mentioned the deficiencies in the prior art, the purpose of this utility model is to provide the ZVT-PWMBUCK circuit that a kind of structure is simple, near zero voltage that is that realize auxiliary switch turns off the improvement reducing loss when auxiliary switch turns off.
To achieve these goals, the utility model adopts following technical scheme:
A ZVT-PWMBUCK circuit for improvement, it comprises main switch, auxiliary switch, resonant inductance and main switch shunt capacitance; It also comprises buffer capacitor, the first diode, the second diode;
The drain electrode that the drain electrode of described main switch connects described auxiliary switch and supply voltage positive pole, drain electrode to be also connected the source electrode of main switch respectively by main switch shunt capacitance with the 3rd diode, source electrode connects supply voltage negative pole, source electrode by the first inductance and the first resistance successively and also connects supply voltage negative pole by the 5th diode, and the two ends of described first resistance are connected with the first electric capacity;
The grid of described auxiliary switch connects supply voltage positive pole, the source electrode bifurcation road of described auxiliary switch, a branch road to be connected the negative pole of described 5th diode by resonant inductance successively with the second diode, another branch road is connected supply voltage negative pole by the 4th diode with the first diode successively;
Between the positive pole that the positive pole of described 5th diode of one end connection of described buffer capacitor, the other end are connected to described 4th diode and the negative pole of the first diode.
Preferably, described main switch and auxiliary switch are IRF640 type metal-oxide-semiconductor.
Preferably, described first diode, the second diode and the 4th diode are MUR1520 type fast recovery diode, and described 5th diode is MUR850 type fast recovery diode.
Owing to have employed such scheme, the utility model improves on traditional ZVT-PWMBUCK circuit structure basis, add buffer capacitor, make the climbing of the both end voltage when auxiliary switch turns off receive the restriction of buffer capacitor, the near zero voltage achieving auxiliary switch turns off, thus reduces consume when auxiliary switch turns off.In addition, after increasing by first diode and the second diode of connecting with resonant inductance, effectively block the internal circulating current existed in traditional circuit, reduce the harmful effect of switching tube parasitic parameter to circuit working, the efficiency of circuit can be made to be further enhanced, this circuit structure is simple, has stronger using value.
Accompanying drawing explanation
Fig. 1 is traditional ZVT-PWMBUCK circuit structure diagram;
Fig. 2 is the circuit structure diagram of the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.
As shown in Fig. 2 composition graphs 1, the ZVT-PWMBUCK circuit of a kind of improvement of the present embodiment, it comprises main switch VS1, auxiliary switch VS2, resonant inductance Lr and main switch shunt capacitance Cr; It also comprises buffer capacitor Cs, the first diode VD1, the second diode VD2.
The drain electrode that the drain electrode of main switch VS1 connects auxiliary switch VS2 and supply voltage Ui positive pole, drain electrode to be also connected the source electrode of main switch VS1 respectively by main switch shunt capacitance Cr with the 3rd diode VD3, source electrode passes through the first inductance L 1 successively and the first resistance R1 connects supply voltage Ui negative pole, source electrode and also passes through the 5th diode VD5 and connect supply voltage Ui negative pole, and the two ends of the first resistance R1 are connected with the first electric capacity C1.
The grid of auxiliary switch VS2 connects supply voltage Ui positive pole, the source electrode bifurcation road of auxiliary switch VS2, a branch road is connected the negative pole of the 5th diode VD5, another branch road by resonant inductance Lr successively to be passed through the 4th diode VD4 successively and is connected supply voltage Ui negative pole with the second diode VD2 with the first diode VD1;
Positive pole, the other end of one end connection the 5th diode VD5 of buffer capacitor Cs are connected between the positive pole of the 4th diode VD4 and the negative pole of the first diode VD1;
Further, the voltage born due to main switch VS1 and auxiliary switch VS2 is all input supply voltage Ui, and therefore, the main switch VS1 of the present embodiment and auxiliary switch VS2 all selects the IRF640 type metal-oxide-semiconductor of low on-state resistance value to meet the demands.
Further, when main switch VS1 ends, the 5th diode VD5 conducting, resonant inductance Lr internal magnetic field energy is transferred to load by the 5th diode VD5, it can thus be appreciated that the forward rated current of the 5th diode VD5 must be greater than load current; When the complete conducting of main switch VS1, input voltage will all be added in the 5th diode VD5 two ends; Therefore, the withstand voltage of the 5th diode VD5 must be greater than supply voltage Ui, and meanwhile, in order to reduce the Reverse recovery consume of the 5th diode VD5 as much as possible, the 5th diode VD5 of the present embodiment selects MUR850 type fast recovery diode.
In like manner, first diode VD1, the second diode VD2 and the 4th diode VD4 also require that forward rated current must be greater than load current, withstand voltage must be greater than input supply voltage Ui value, and the first diode VD1, the second diode VD2 of the present embodiment and the 4th diode VD4 all select MUR1520 type fast recovery diode to meet the demands.
The present embodiment improves on traditional ZVT-PWMBUCK circuit structure, adds buffer capacitor Cs, makes, when auxiliary switch VS2 turns off, to reduce switching loss; After increasing the first diode VD1 and the second diode VD2 connected with resonant inductance Lr, effectively block the internal circulating current existed in traditional circuit, reduce the harmful effect of switching tube parasitic parameter to circuit working, the efficiency of circuit can be made to be further enhanced; This circuit structure is simple, has stronger using value.
The foregoing is only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model specification and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (3)
1. the ZVT-PWMBUCK circuit improved, it comprises main switch, auxiliary switch, resonant inductance and main switch shunt capacitance; It is characterized in that: it also comprises buffer capacitor, the first diode, the second diode;
The drain electrode that the drain electrode of described main switch connects described auxiliary switch and supply voltage positive pole, drain electrode to be also connected the source electrode of main switch respectively by main switch shunt capacitance with the 3rd diode, source electrode connects supply voltage negative pole, source electrode by the first inductance and the first resistance successively and also connects supply voltage negative pole by the 5th diode, and the two ends of described first resistance are connected with the first electric capacity;
The grid of described auxiliary switch connects supply voltage positive pole, the source electrode bifurcation road of described auxiliary switch, a branch road to be connected the negative pole of described 5th diode by resonant inductance successively with the second diode, another branch road is connected supply voltage negative pole by the 4th diode with the first diode successively;
Between the positive pole that the positive pole of described 5th diode of one end connection of described buffer capacitor, the other end are connected to described 4th diode and the negative pole of the first diode.
2. the ZVT-PWMBUCK circuit of a kind of improvement as claimed in claim 1, is characterized in that: described main switch and auxiliary switch are IRF640 type metal-oxide-semiconductor.
3. the ZVT-PWMBUCK circuit of a kind of improvement as claimed in claim 1, is characterized in that: described first diode, the second diode and the 4th diode are MUR1520 type fast recovery diode, and described 5th diode is MUR850 type fast recovery diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520155250.2U CN204538968U (en) | 2015-03-18 | 2015-03-18 | A kind of ZVT-PWMBUCK circuit of improvement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520155250.2U CN204538968U (en) | 2015-03-18 | 2015-03-18 | A kind of ZVT-PWMBUCK circuit of improvement |
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| CN204538968U true CN204538968U (en) | 2015-08-05 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105871202A (en) * | 2016-06-17 | 2016-08-17 | 扬州大学 | Single-tube buck-boost soft switching device |
| CN107302309A (en) * | 2016-04-15 | 2017-10-27 | 德州仪器公司 | Method and apparatus during adaptometer for zero voltage transition power converter |
| CN107529249A (en) * | 2017-07-06 | 2017-12-29 | 山东枇枇电子科技有限公司 | A kind of intelligent high-power LED attracting lamp control system and its control method |
| CN107635304A (en) * | 2017-07-06 | 2018-01-26 | 山东枇枇电子科技有限公司 | A kind of BUCK constant-current control circuits and its application in great power LED attracting lamp control system |
| CN107834851A (en) * | 2017-11-22 | 2018-03-23 | 中国电子科技集团公司第四十三研究所 | A kind of high voltage inputs soft switch BUCK circuit |
| US11038421B2 (en) | 2016-04-14 | 2021-06-15 | Texas Instruments Incorporated | Methods and apparatus for adaptive timing for zero voltage transition power converters |
-
2015
- 2015-03-18 CN CN201520155250.2U patent/CN204538968U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11038421B2 (en) | 2016-04-14 | 2021-06-15 | Texas Instruments Incorporated | Methods and apparatus for adaptive timing for zero voltage transition power converters |
| CN107302309A (en) * | 2016-04-15 | 2017-10-27 | 德州仪器公司 | Method and apparatus during adaptometer for zero voltage transition power converter |
| CN107302309B (en) * | 2016-04-15 | 2020-11-24 | 德州仪器公司 | Method and apparatus for adaptive timing of zero voltage transition power converters |
| CN105871202A (en) * | 2016-06-17 | 2016-08-17 | 扬州大学 | Single-tube buck-boost soft switching device |
| CN107529249A (en) * | 2017-07-06 | 2017-12-29 | 山东枇枇电子科技有限公司 | A kind of intelligent high-power LED attracting lamp control system and its control method |
| CN107635304A (en) * | 2017-07-06 | 2018-01-26 | 山东枇枇电子科技有限公司 | A kind of BUCK constant-current control circuits and its application in great power LED attracting lamp control system |
| CN107529249B (en) * | 2017-07-06 | 2020-05-19 | 山东枇枇电子科技有限公司 | Intelligent high-power LED fish attracting lamp control system and control method thereof |
| CN107834851A (en) * | 2017-11-22 | 2018-03-23 | 中国电子科技集团公司第四十三研究所 | A kind of high voltage inputs soft switch BUCK circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 274000 Ji'nan Road, Heze Development Zone, Shandong, No. 999 Patentee after: Shandong Mingda electric appliance Limited by Share Ltd Address before: 274000 Ji'nan Road, Heze Development Zone, Shandong, No. 999 Patentee before: Shandong Ming great Electrical Appliances Co., Ltd |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150805 Termination date: 20200318 |
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| CF01 | Termination of patent right due to non-payment of annual fee |