CN114204808A - BUCK voltage reduction circuit - Google Patents
BUCK voltage reduction circuit Download PDFInfo
- Publication number
- CN114204808A CN114204808A CN202111364160.0A CN202111364160A CN114204808A CN 114204808 A CN114204808 A CN 114204808A CN 202111364160 A CN202111364160 A CN 202111364160A CN 114204808 A CN114204808 A CN 114204808A
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- Prior art keywords
- circuit
- buck
- diode
- booster circuit
- capacitor
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- Pending
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- 230000009467 reduction Effects 0.000 title claims abstract description 26
- 239000003990 capacitor Substances 0.000 claims abstract description 41
- 230000007547 defect Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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Classifications
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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
- H02M3/156—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 with automatic control of output voltage or current, e.g. switching regulators
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
A BUCK voltage reduction circuit comprises a main loop, wherein a switch tube and an inductor are sequentially connected in series on a positive line of the main loop; the BUCK voltage reduction circuit also comprises a booster circuit, wherein the booster circuit comprises a first diode of the booster circuit, a capacitor of the booster circuit, a second diode of the booster circuit and a switch of the booster circuit; the positive end of the first diode of the booster circuit is connected with the input end of the booster circuit, the negative end of the first diode of the booster circuit is connected with the capacitor of the booster circuit, the positive end of the second diode of the booster circuit is connected with one end of the capacitor of the booster circuit, and the negative end of the second diode of the booster circuit is connected with the main loop; one end of the booster circuit switch is connected to a circuit between the booster circuit capacitor and the second diode of the booster circuit, and the other end of the booster circuit switch is grounded; the voltage boosting circuit arranged on the switching tube of the voltage reducing circuit can ensure the normal driving of the switching tube and has a simpler structure.
Description
Technical Field
The invention relates to a BUCK voltage reduction circuit.
Background
The BUCK circuit is a common dc-dc BUCK converter circuit, and as shown in fig. 1, the BUCK circuit generally includes a capacitor, an inductor, and a diode; in order to realize the connection and disconnection of the circuit, a switching tube is usually arranged on the circuit, the switching tube is connected with a control chip or a single chip microcomputer, and the switching tube can automatically disconnect or connect a main loop of the voltage reduction circuit under the control action of the control chip or the single chip microcomputer. Research shows that when the switch tube is driven, a voltage higher than a source electrode is needed; to ensure that the switching tube gets a higher voltage than the source, conventional circuits typically have a voltage boost circuit at the switching tube. Although the booster circuit can partially solve the defect that the driving voltage of the switching tube is higher than the source voltage, the circuit structure of the booster circuit is complex and high in cost.
In order to solve the technical problems of complex structure and high cost of the conventional BUCK circuit switching tube booster circuit, the inventor of the applicant has designed two structural forms of booster circuits for boosting the switching tube of the BUCK circuit, but researches have found that the two structural forms of booster circuits may not drive the switching tube in the working process, or the booster circuit structure is simple, but still has a room for improvement.
Disclosure of Invention
The invention provides a BUCK circuit, which is a boost circuit arranged on a switching tube of the BUCK circuit, can ensure that the driving voltage of the switching tube is higher than the source voltage, and has a simpler structure.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a BUCK voltage reduction circuit comprises a voltage reduction circuit input end, a voltage reduction circuit output end and a main loop connected between the voltage reduction circuit input end and the voltage reduction circuit output end, wherein a switch tube and an inductor are sequentially connected in series on a positive line of the main loop; the BUCK voltage reduction circuit also comprises a booster circuit for boosting the switch tube, and the booster circuit comprises a first diode of the booster circuit, a capacitor of the booster circuit, a second diode of the booster circuit and a switch of the booster circuit; the boost circuit comprises a boost circuit first diode, a boost circuit capacitor and a boost circuit second diode which are sequentially connected in series, wherein the positive end of the boost circuit first diode is connected with the input end of the boost circuit, the negative end of the boost circuit first diode is connected with the boost circuit capacitor, the positive end of the boost circuit second diode is connected with one end of the boost circuit capacitor, and the negative end of the boost circuit second diode is connected with a main loop between a buck circuit switch tube and an inductor; one end of the booster circuit switch is connected to a circuit between the booster circuit capacitor and the booster circuit second diode, and the other end of the booster circuit switch is grounded.
According to the design concept of the invention, the BUCK step-down circuit in the technical scheme of the invention further comprises a step-down circuit diode, wherein the cathode end of the step-down circuit diode is connected to the anode line of the main loop of the BUCK circuit between the switch tube and the inductor, and the anode end of the step-down circuit diode is connected to the cathode line of the main loop of the BUCK circuit.
According to the design concept of the invention, the BUCK voltage reducing circuit in the technical scheme of the invention further comprises a voltage reducing circuit capacitor, the voltage reducing circuit capacitor is arranged at the output end of the voltage reducing circuit, one end of the voltage reducing circuit capacitor is connected with the output end line of the inductor on the main loop, and the other end of the voltage reducing circuit capacitor is connected with the negative electrode line of the main loop of the voltage reducing circuit.
According to the design concept of the invention, the switch tube in the technical scheme of the invention is an MOS tube.
Compared with the prior art, the invention has the beneficial effects that: (1) when the BUCK voltage reduction circuit starts to work, the switch of the voltage boosting circuit can be closed firstly, the capacitor of the voltage boosting circuit is precharged, and the switch of the voltage boosting circuit is disconnected after the capacitor of the voltage boosting circuit is precharged. When the input voltage of the BUCK voltage reduction circuit to the switch tube is small, the switch of the voltage boosting circuit is switched off, and the capacitor of the voltage boosting circuit is pre-charged, so that the capacitor of the voltage boosting circuit can provide the input voltage to the switch tube at the moment, the driving voltage of the switch tube is higher than the voltage of the source electrode, the work of the switch tube is ensured, and the defect that the whole BUCK voltage reduction circuit cannot work due to the fact that the switch tube cannot be driven due to too low voltage is avoided; (2) the booster circuit structure only comprises two diodes, a capacitor and a switch structure, and has the advantages of simple structure, low cost and strong practicability.
Drawings
Fig. 1 is a schematic diagram of a BUCK circuit according to the present invention, in which an example of a switch is an MOS transistor.
Detailed Description
Referring to fig. 1, the BUCK step-down circuit of the invention includes a step-down circuit input end and a step-down circuit output end, a main loop is arranged between the step-down circuit input end and the step-down circuit output end, and a switch tube Q0 and an inductor L0 are sequentially connected in series on a positive line of the main loop; the switching tube Q0 is preferably a MOS tube.
In the voltage reduction circuit, a voltage reduction circuit diode D0 is also arranged between the switching tube Q0 and the inductor L0, the positive electrode end of the voltage reduction circuit diode D0 is connected with the negative electrode circuit of the main loop of the BUCK voltage reduction circuit, and the negative electrode end of the voltage reduction circuit diode D0 is connected with the positive electrode circuit between the switching tube Q0 and the inductor L0.
The BUCK circuit further comprises a BUCK circuit capacitor C0, wherein the BUCK circuit capacitor C0 is arranged at the output end of the BUCK circuit, one end of the BUCK circuit capacitor is connected with the output end line of the inductor L0 on the main loop, and the other end of the BUCK circuit capacitor is connected with the negative electrode line of the main loop of the BUCK circuit.
In order to ensure that the voltage at the switching tube Q0 is higher than the source voltage when the switching tube Q0 works, the voltage reduction circuit is also provided with a voltage boosting circuit for boosting the voltage of the switching tube Q0, and the voltage boosting circuit can ensure that the voltage at two ends of the switching tube Q0 is higher than the source voltage when the switching tube Q0 works.
The booster circuit comprises a first booster circuit diode D1, a booster circuit capacitor C1, a second booster circuit diode D2 and a booster circuit switch Q1, wherein the first booster circuit diode D1, the booster circuit capacitor C1 and the second booster circuit diode D2 are sequentially connected in series.
Furthermore, the positive end of the first diode D1 of the booster circuit is connected with the input end of the booster circuit, and the negative end of the first diode D1 of the booster circuit is connected with the capacitor C1 of the booster circuit; one end of the boost circuit switch Q1 is connected in circuit between the boost circuit capacitor C1 and the boost circuit second diode D2, while the other end of the boost circuit switch Q1 is grounded.
When the BUCK voltage reducing circuit starts to work, the boost circuit structure of the invention can close the switch Q1 of the boost circuit, pre-charge the capacitor C1 of the boost circuit, and open the switch Q1 of the boost circuit after the pre-charge of the capacitor C1 of the boost circuit is finished. When the BUCK circuit is smaller in input voltage to the switching tube Q0, the switch Q1 of the boost circuit is disconnected, and the capacitor C1 of the boost circuit is pre-charged, at the moment, the capacitor C1 of the boost circuit can provide voltage for the switching tube Q0, so that the driving voltage of the switching tube Q0 is higher than the voltage of the source electrode, the work of the switching tube Q0 is ensured, the problem that the switching tube Q0 cannot be driven due to too low voltage of the switching tube Q0 is avoided, and the defect that the whole BUCK circuit cannot work is caused.
It can be seen from the above boost circuit structure that the boost circuit of the switching tube Q0 of the present invention only includes two diodes D1, D2, a capacitor C1 and a switching structure Q1, and has the advantages of simple structure, low cost and strong practicability.
Claims (4)
1. A BUCK voltage reduction circuit comprises a voltage reduction circuit input end, a voltage reduction circuit output end and a main loop connected between the voltage reduction circuit input end and the voltage reduction circuit output end, wherein a switch tube and an inductor are sequentially connected in series on a positive line of the main loop; the BUCK circuit is characterized by further comprising a booster circuit for boosting the switch tube, wherein the booster circuit comprises a first diode of the booster circuit, a capacitor of the booster circuit, a second diode of the booster circuit and a switch of the booster circuit; the boost circuit comprises a boost circuit first diode, a boost circuit capacitor and a boost circuit second diode which are sequentially connected in series, wherein the positive end of the boost circuit first diode is connected with the input end of the boost circuit, the negative end of the boost circuit first diode is connected with the boost circuit capacitor, the positive end of the boost circuit second diode is connected with one end of the boost circuit capacitor, and the negative end of the boost circuit second diode is connected with a main loop between a buck circuit switch tube and an inductor; one end of the booster circuit switch is connected to a circuit between the booster circuit capacitor and the booster circuit second diode, and the other end of the booster circuit switch is grounded.
2. The BUCK voltage circuit according to claim 1, wherein the BUCK voltage circuit further includes a BUCK circuit diode, a negative terminal of the BUCK circuit diode being connected to a positive terminal of the main loop of the BUCK circuit between the switching tube and the inductor, and a positive terminal of the BUCK circuit diode being connected to a negative terminal of the main loop of the BUCK circuit.
3. The BUCK voltage circuit according to claim 2, wherein the BUCK voltage circuit further includes a BUCK circuit capacitor, the BUCK circuit capacitor is disposed at an output terminal of the BUCK circuit, and one end of the BUCK circuit capacitor is connected to an output terminal line of the inductor in the main loop and the other end of the BUCK circuit capacitor is connected to a negative terminal line of the main loop of the BUCK circuit.
4. The BUCK circuit according to any of the claims 1 to 3, wherein the switching tubes are MOS tubes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111364160.0A CN114204808A (en) | 2021-11-17 | 2021-11-17 | BUCK voltage reduction circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111364160.0A CN114204808A (en) | 2021-11-17 | 2021-11-17 | BUCK voltage reduction circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114204808A true CN114204808A (en) | 2022-03-18 |
Family
ID=80647941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111364160.0A Pending CN114204808A (en) | 2021-11-17 | 2021-11-17 | BUCK voltage reduction circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114204808A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204103759U (en) * | 2014-09-18 | 2015-01-14 | 矽力杰半导体技术(杭州)有限公司 | Be applicable to power supply circuits and the bridge circuit of upper switching tube driving in bridge circuit |
| CN104917359A (en) * | 2015-06-01 | 2015-09-16 | 矽力杰半导体技术(杭州)有限公司 | Upper switch tube driving circuit and synchronization boost circuit using the same |
| CN104935154A (en) * | 2015-07-10 | 2015-09-23 | 灿瑞半导体(上海)有限公司 | Bootstrap circuit of step-down converter |
| CN206922649U (en) * | 2017-04-28 | 2018-01-23 | 苏州汇川联合动力系统有限公司 | A kind of double down booster circuit |
-
2021
- 2021-11-17 CN CN202111364160.0A patent/CN114204808A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204103759U (en) * | 2014-09-18 | 2015-01-14 | 矽力杰半导体技术(杭州)有限公司 | Be applicable to power supply circuits and the bridge circuit of upper switching tube driving in bridge circuit |
| CN104917359A (en) * | 2015-06-01 | 2015-09-16 | 矽力杰半导体技术(杭州)有限公司 | Upper switch tube driving circuit and synchronization boost circuit using the same |
| CN104935154A (en) * | 2015-07-10 | 2015-09-23 | 灿瑞半导体(上海)有限公司 | Bootstrap circuit of step-down converter |
| CN206922649U (en) * | 2017-04-28 | 2018-01-23 | 苏州汇川联合动力系统有限公司 | A kind of double down booster circuit |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220318 |