CN112928913A - Buck conversion circuit and lossless absorption circuit thereof - Google Patents
Buck conversion circuit and lossless absorption circuit thereof Download PDFInfo
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- CN112928913A CN112928913A CN202110112888.8A CN202110112888A CN112928913A CN 112928913 A CN112928913 A CN 112928913A CN 202110112888 A CN202110112888 A CN 202110112888A CN 112928913 A CN112928913 A CN 112928913A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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Abstract
The invention discloses a buck conversion circuit and a lossless absorption circuit thereof, wherein the lossless absorption circuit comprises a first node A, a second node B, a third node C, a fourth node D, a capacitor C2, a capacitor C4, a diode D2, a diode D3, a diode D4 and an inductor Ld. One end of the capacitor C2 is connected to the first node a, the other end thereof is connected to the anode of the diode D2, and the cathode of the diode D2 is connected to the second node B; the inductor Ld is connected between the second node B and the third node C; one end of the capacitor C4 is connected to the third node C, the other end thereof is connected to the cathode of the diode D4, and the anode of the diode D4 is connected to the fourth node D; the diode D3 has an anode connected to the connection node E between the capacitor C4 and the diode D4 and a cathode connected to the connection node F between the capacitor C2 and the diode D2. Compared with the prior art, the invention not only can effectively improve the reverse recovery current of the main diode, reduce turn-off loss and reduce the switching loss of the IGBT, but also can mainly reduce the temperature rise of the main diode and improve the power density of the BUCK circuit.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of switching power supplies, in particular to a buck conversion circuit and a lossless absorption circuit thereof.
[ background of the invention ]
The large reverse recovery current of the main diode of the BUCK circuit (i.e. the BUCK conversion circuit) causes the diode to generate large loss and high temperature rise, thereby limiting the improvement of the power of the whole BUCK circuit, increasing the loss of an Insulated Gate Bipolar Transistor (IGBT), causing worse EMC (i.e. electromagnetic compatibility) characteristics, and finally, the energy absorbed by the buffer capacitor can be consumed by a resistor or an equivalent passive device.
Therefore, there is a need to provide a new technical solution to overcome the above problems.
[ summary of the invention ]
The invention aims to provide a BUCK conversion circuit and a lossless absorption circuit thereof, which can effectively improve the reverse recovery current of a main diode, reduce turn-off loss, reduce the switching loss of an IGBT, and more importantly can reduce the temperature rise of the main diode and improve the power density of a BUCK circuit.
In order to solve the above problem, according to a first aspect of the present invention, there is provided a lossless snubber circuit including a first node a, a second node B, a third node C, a fourth node D, a capacitor C2, a capacitor C4, a diode D2, a diode D3, a diode D4, and an inductor Ld. One end of the capacitor C2 is connected to the first node a, the other end thereof is connected to the anode of the diode D2, and the cathode of the diode D2 is connected to the second node B; the inductor Ld is connected between the second node B and a third node C; one end of the capacitor C4 is connected to the third node C, the other end thereof is connected to the cathode of the diode D4, and the anode of the diode D4 is connected to the fourth node D; the anode of the diode D3 is connected to the connection node E between the capacitor C4 and the diode D4, and the cathode thereof is connected to the connection node F between the capacitor C2 and the diode D2.
According to another aspect of the present invention, the present invention provides a buck converter circuit comprising a power switch Q1, a main diode D1, an inductor L1, a capacitor C3, and a lossless snubber circuit. One end of the power switch Q1 is connected to the second node B, and the other end thereof is connected to the first node a; the cathode of the main diode D1 is connected to the third node C, and the anode thereof is connected to the fourth node D; one end of the inductor L1 is connected with the third node C, and the other end of the inductor L1 is connected with the positive output terminal Vout + of the buck conversion circuit; the input negative terminal Vin-and the output negative terminal Vout-of the buck conversion circuit are connected with the fourth node D; an input positive terminal Vin + of the buck conversion circuit is connected with the first node A; the capacitor C3 is connected between the positive output terminal Vout + and the negative output terminal Vout-of the buck converter circuit. The lossless absorption circuit comprises a first node A, a second node B, a third node C, a fourth node D, a capacitor C2, a capacitor C4, a diode D2, a diode D3, a diode D4 and an inductor Ld. One end of the capacitor C2 is connected to the first node a, the other end thereof is connected to the anode of the diode D2, and the cathode of the diode D2 is connected to the second node B; the inductor Ld is connected between the second node B and a third node C; one end of the capacitor C4 is connected to the third node C, the other end thereof is connected to the cathode of the diode D4, and the anode of the diode D4 is connected to the fourth node D; the anode of the diode D3 is connected to the connection node E between the capacitor C4 and the diode D4, and the cathode thereof is connected to the connection node F between the capacitor C2 and the diode D2.
Compared with the prior art, the invention reduces the loss of the diode and the switching loss of the IGBT by optimizing the lossless absorption circuit and controlling the speed of the current switching-on and switching-off of the diode on the one hand; on the other hand, leakage inductance existing in the circuit can be fed back into the capacitor, so that the purpose of no damage is achieved; on the other hand, the temperature rise of the main diode can be reduced, and the power density of the BUCK circuit is improved.
Other objects, features and advantages of the present invention will be described in detail in the following detailed description of the preferred embodiments, which proceeds with reference to the accompanying drawings.
[ description of the drawings ]
The present invention will be more readily understood by reference to the following detailed description when considered in conjunction with the accompanying drawings, wherein like reference numerals designate like structural elements, and in which:
fig. 1 is a circuit diagram of a buck converter circuit according to an embodiment of the invention.
[ detailed description ] embodiments
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least an implementation of the invention. The appearances of the phrase "in one embodiment" 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. The terms "plurality" or "a plurality" in the present invention mean two or more. "and/or" in the present invention means "and" or ".
Fig. 1 is a schematic circuit diagram of a buck converter circuit (buck circuit) according to an embodiment of the invention. The buck converter circuit shown in fig. 1 includes a power switch (or switching device) Q1, a main diode D1, an inductor L1, a capacitor C1, a capacitor C3, and a lossless snubber circuit 110.
The lossless snubber circuit 110 includes a first node a, a second node B, a third node C, a fourth node D, a capacitor C2, a capacitor C4, a diode D2, a diode D3, a diode D4, and an inductor Ld. One end of the capacitor C2 is connected to the first node a, the other end thereof is connected to the anode of the diode D2, and the cathode of the diode D2 is connected to the second node B; the inductor Ld is connected between the second node B and the third node C; one end of the capacitor C4 is connected to the third node C, the other end thereof is connected to the cathode of the diode D4, and the anode of the diode D4 is connected to the fourth node D; the diode D3 has an anode connected to the connection node E between the capacitor C4 and the diode D4 and a cathode connected to the connection node F between the capacitor C2 and the diode D2. The first node A is connected with the positive input terminal Vin + of the buck conversion circuit; the second node B is connected to one end of a power switch Q1; the third node C is connected to the cathode of the main diode D1; the fourth node D is connected to the anode of the main diode D1.
One end of the power switch Q1 is connected to the second node B, and the other end thereof is connected to the first node a; the cathode of the main diode D1 is connected to the third node C, and the anode thereof is connected to the fourth node D; one end of the inductor L1 is connected with the third node C, and the other end of the inductor L1 is connected with the output positive terminal Vout + of the buck conversion circuit; the input negative terminal Vin-and the output negative terminal Vout-of the buck conversion circuit are connected with the fourth node D; the input positive terminal Vin + of the buck conversion circuit is connected with the first node A; the capacitor C3 is connected between the output positive terminal Vout + and the output negative terminal Vout-of the buck conversion circuit; the capacitor C1 is connected between the input positive terminal Vin + and the input negative terminal Vin-of the buck conversion circuit.
In one embodiment, power switch Q1 may be a mosfet (Metal-Oxide-Semiconductor Field-Effect Transistor) or an IGBT (Insulated Gate Bipolar Transistor),
the operation of the lossless snubber circuit 110 shown in fig. 1 is described in detail below.
1. When the power switch Q1 is turned on (or turned on), the current in the main diode D1 is transferred to the power switch Q1, and due to the existence of the inductor Ld, the current rising rate of the power switch Q1 (i.e., the current falling rate of the main diode D1) is limited, so that the reverse recovery current of the main diode D1 is reduced, and at the same time, the turn-on loss of the power switch Q1 is reduced because the current rising rate of the power switch Q1 is reduced.
2. When the power switch Q1 is turned on and the current in the main diode D1 is completely transferred to the power switch Q1, the main diode D1 is naturally turned off, the inductor Ld and the capacitors C2 and C4 start resonance through the diode D3 and the power switch Q1, the current in the power switch Q1 continues to rise, when the energy in the capacitor C2 is completely transferred to the capacitor C4, the Vc2 is equal to 0V, wherein the Vc2 is the voltage drop across the capacitor C2, and the circuit operation state is recovered to be the same as that of the original buck circuit.
3. When the power switch Q1 is turned off, the current in the power switch Q1 is transferred to the capacitor C2, the capacitor C2 starts to be charged, the Vc2 starts to rise, the capacitor C4 starts to discharge, and the Vc4 falls, wherein the Vc4 is the voltage drop across the capacitor C4, when the voltage of the capacitor C2 is charged to the BUS voltage (i.e., the BUS voltage or the BUS voltage), the main diode D1 is turned on, and the energy in the inductor L1 is released to the capacitor C3 through the main diode D1. The turn-off loss of the power switch Q1 is reduced because the capacitor C2 limits the rate of rise of Vds (drain-source voltage) of the power switch Q1.
In summary, the lossless snubber circuit 110 is optimized, on one hand, the loss of the main diode D1 is reduced and the switching loss of the IGBT is reduced by controlling the speed of the on and off current of the main diode D1; on the other hand, leakage inductance existing in the circuit can be fed back into the capacitor, so that the purpose of no damage is achieved; on the other hand, the temperature rise of the main diode D1 can be reduced, and the power density of the BUCK circuit can be improved.
In the present invention, the terms "connected", connected, "connected" and "connecting" mean electrically or communicatively connected, or directly or indirectly connected, unless otherwise specified. As used herein, "coupled" refers to indirect or direct electrical connections, which may be through one or more electrical devices (e.g., resistors, capacitors, inductors, etc.).
The foregoing description has disclosed fully preferred embodiments of the present invention. It should be noted that those skilled in the art can make modifications to the embodiments of the present invention without departing from the scope of the appended claims. Accordingly, the scope of the appended claims is not to be limited to the specific embodiments described above.
Claims (5)
1. A lossless snubber circuit, comprising a first node A, a second node B, a third node C, a fourth node D, a capacitor C2, a capacitor C4, a diode D2, a diode D3, a diode D4, and an inductor Ld,
one end of the capacitor C2 is connected to the first node a, the other end thereof is connected to the anode of the diode D2, and the cathode of the diode D2 is connected to the second node B; the inductor Ld is connected between the second node B and a third node C; one end of the capacitor C4 is connected to the third node C, the other end thereof is connected to the cathode of the diode D4, and the anode of the diode D4 is connected to the fourth node D; the anode of the diode D3 is connected to the connection node E between the capacitor C4 and the diode D4, and the cathode thereof is connected to the connection node F between the capacitor C2 and the diode D2.
2. The lossless snubber circuit of claim 1,
the first node A is connected with the positive input terminal Vin + of the buck conversion circuit;
the second node B is connected with one end of a power switch Q1 of the buck conversion circuit;
the third node C is connected with the cathode of the main diode D1 of the buck conversion circuit;
the fourth node D is connected to the anode of the main diode D1.
3. The lossless snubber circuit according to claim 1,
the power switch Q1 is a metal-oxide semiconductor field effect transistor; or
The power switch Q1 is an insulated gate bipolar transistor.
4. A buck converter circuit comprising a power switch Q1, a main diode D1, an inductor L1, a capacitor C3, and a lossless snubber circuit as claimed in any one of claims 1 to 3,
one end of the power switch Q1 is connected to the second node B, and the other end thereof is connected to the first node a;
the cathode of the main diode D1 is connected to the third node C, and the anode thereof is connected to the fourth node D;
one end of the inductor L1 is connected with the third node C, and the other end of the inductor L1 is connected with the positive output terminal Vout + of the buck conversion circuit;
the input negative terminal Vin-and the output negative terminal Vout-of the buck conversion circuit are connected with the fourth node D;
an input positive terminal Vin + of the buck conversion circuit is connected with the first node A;
the capacitor C3 is connected between the positive output terminal Vout + and the negative output terminal Vout-of the buck converter circuit.
5. The buck converter circuit according to claim 4, further comprising a capacitor C1,
the capacitor C1 is connected between the positive input terminal Vin + and the negative input terminal Vin-of the buck conversion circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110112888.8A CN112928913A (en) | 2021-01-27 | 2021-01-27 | Buck conversion circuit and lossless absorption circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110112888.8A CN112928913A (en) | 2021-01-27 | 2021-01-27 | Buck conversion circuit and lossless absorption circuit thereof |
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| Publication Number | Publication Date |
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| CN112928913A true CN112928913A (en) | 2021-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110112888.8A Pending CN112928913A (en) | 2021-01-27 | 2021-01-27 | Buck conversion circuit and lossless absorption circuit thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113885628A (en) * | 2021-08-26 | 2022-01-04 | 山东秉恬信息科技有限公司 | Integrated circuit control chip of intelligent water meter based on Internet of things |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1400728A (en) * | 2002-08-05 | 2003-03-05 | 浙江大学 | Three-level passive flexible switch D.C. Transformer circuit |
| CN1499703A (en) * | 2002-11-08 | 2004-05-26 | 杭州千岛湖恒源电气有限公司 | Soft switching circuit without absorption loss |
| CN101510726A (en) * | 2009-03-23 | 2009-08-19 | 浙江大学 | Passive clamping voltage boosting type interleave parallel connection converter implemented by coupling inductance and switch capacitance |
| CN104113208A (en) * | 2014-07-02 | 2014-10-22 | 三峡大学 | Interleaved Boost converter comprising lossless buffer circuit |
| CN106329903A (en) * | 2016-11-18 | 2017-01-11 | 郑州云海信息技术有限公司 | Buffer circuit used for Buck converter |
-
2021
- 2021-01-27 CN CN202110112888.8A patent/CN112928913A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1400728A (en) * | 2002-08-05 | 2003-03-05 | 浙江大学 | Three-level passive flexible switch D.C. Transformer circuit |
| CN1499703A (en) * | 2002-11-08 | 2004-05-26 | 杭州千岛湖恒源电气有限公司 | Soft switching circuit without absorption loss |
| CN101510726A (en) * | 2009-03-23 | 2009-08-19 | 浙江大学 | Passive clamping voltage boosting type interleave parallel connection converter implemented by coupling inductance and switch capacitance |
| CN104113208A (en) * | 2014-07-02 | 2014-10-22 | 三峡大学 | Interleaved Boost converter comprising lossless buffer circuit |
| CN106329903A (en) * | 2016-11-18 | 2017-01-11 | 郑州云海信息技术有限公司 | Buffer circuit used for Buck converter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113885628A (en) * | 2021-08-26 | 2022-01-04 | 山东秉恬信息科技有限公司 | Integrated circuit control chip of intelligent water meter based on Internet of things |
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Application publication date: 20210608 |
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